Title: Supporting Letter for the Hadron Experimental Facility
Extension Project at J-PARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We have known that the activities at the J-PARC Hadron Experimental
Facility are well acknowledged in particle, hadron, and nuclear
physics, and their related fields. In particular, we believe that
their projects conducted at J-PARC are internationally important andneed further support from the world-wide community. It would be ourgreat pleasure to strongly support the Hadron Experimental Facility
Extension Project at J-PARC, and, activities of HUA for the project.
We hope a further success in the new project.
Sincerely
Franco Garibaldi
Director of Research
National Institute for Nuclear Physics (INFN)
and
Guido Maria Urciuoli
Senior Researcher
National Institute for Nuclear Physics (INFN)

August 20, 2021

Subject: International Letter of Support for the Hadron Experimental Facility Extension
Project at J-PARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association:
It is widely recognized throughout the international community of physicists that theactivities carried out at the J-PARC Hadron Experimental Facility are highly regarded
within the fields of particle, hadronic, and nuclear physics. In particular, it is our firm andsteadfast belief that these projects conducted at J-PARC are of world-wide significance.
As such, it is with great pleasure to write this letter offering our strong support for the
Hadron Experimental Facility Extension Project at J-PARC and all the associated activities
of HUA comprising the scope of this project.
We hope and expect great success with this new project. Please let us know how we may
help with this success.

Sincerely yours,

Kyungseon Joo
Professor
University of Connecticut
Chair of
The CLAS Collaboration

196 AUDITORIUM ROAD, UNIT 3046
STORRS, CT 06269-3046
PHONE 860.486.4915
FAX 860.486.3346
physics@uconn.edu
www.physics.uconn.edu

Philip L. Cole
Professor and Chair
Lamar University

Chaden Djalali
Professor
Ohio University

U NIVER SITY O F I LLINOI SAT U RB ANA -C H AMPAIG N
Department of Physics
1110 West Green Street
Urbana, IL 61801-3080

August 17, 2021
Prof. Koji Miwa,
Chair
Hadron Experimental Facility Extension Project at J-PARC
Dear Prof. Miwa,
I am writing to express my strongest support for the Hadron Experimental Facility Extension
Project at J-PARC. As a world-class facility for fundamental basic research in nuclear andparticle physics, J-PARC provides intense secondary kaon beams not available in any otherfacilities world-wide. In particular, the hadron physics and the hypernuclear physics programs to
be explored with the Hadron Hall Extension Project are unique and complementary to physics
programs being pursued at other international facilities, such as the Jefferson Laboratory electron
accelerator. A successful and timely completion of the Hadron Hall Extension Project would help
realizing the immense scientific potential of J-PARC, and could lead to many exciting new
discoveries.

Sincerely yours,

Jen-Chieh Peng
Professor of Physics
University of Illinois at Urbana-Champaign

Telephone (217)-244-6039 • Fax (217) 333-1215 • E-mail: jcpeng@uiuc.edu

Saskatoon, Aug 19, 2021

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
Re: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
The hadron facility at J-PARC is unique in the world in that it offers a venue for the experimentalists to carryout precision measurements to serve as valuable testing grounds ofhadron physics models of structures and symmetries.
It is no exaggeration to say that the activities at the J-PARC Hadron Experimental Facility are
well acknowledged in particle, hadron, and nuclear physics, and related fields. The projects
conducted at J-PARC are of importance for international hadron physics community and canbenefit from further support of the J-PARC organization and world-wide community. The
proposed Hadron Experimental Facility Extension Project at J-PARC, and the activities of
HUA for the project, when implemented, will enhance their value significantly. This letter is
to express my strong support and wish them great success in the new project.
Sincerely

Dr. C. Rangacharyulu
Professor of Physics and Engineering Physics

Department of Physics

Mark Strikman
104 Davey Laboratory
University Park PA 16802
U.S.A.
Tel: +1 (814) 883-6611
FAX: +1 (814) 865-3604
E-mail: mxs43@psu.edu

August 25, 2021
Professor Koji Miwa,
Chair of J-PARC Hadron Hall Users’ Association,
Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
I am well aware of the the pioneering activities at the J-PARC Hadron Experimental Facility
in the fields of particle and hadronic and nuclear physics. They are nicely complemented
by the experimental activities at the high energy electron TJNAF facility, planned research
the future FAIR facility in Germany, studies of the resonance production at LHCb. The
proposed Hadron Experimental Facility Extension Project at J-PARC, and, activities of
HUA for the project add in important way to the spectroscopy studies. They would add
another important component - investigation of the interplay between soft and hard physics
in a variety of reactions. Especially noteworthy are exclusive reactions with production ofcharm baryon and anticharm meson and exclusive Drell- Yan production in high energy pion(kaon) induced processes. Complementary of these studies and studies exclusive electron
induced reactions are well recognized by the world-wide QCD community.
Overall, I very strongly support the the Hadron Experimental Facility Extension Project
and wish it a speedy progress.
.

Mark Strikman
Distinguished Professor of Physics

---------------- The Supporting Letter -----Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association!
The J-PARC Hadron Experimental Facility is the research center of world
significance for the study of nuclear, hadron and particle physics. The new proposal
for the Extension of the J-PARC Hadron Experimental Facility will allow
experimental studies of such topical issues of modern hadron Physics as:(i)central NN interactions (as well as the lightest nuclei interactions) at
small impact parameters (less than 0.4 Fm) and the energy region (c.m.)from few GeV up to 10 GeV, i.e. in the Non-Perturbative QCD region;(ii) the interaction of hadrons containing strange quarks;(iii) the role of spin-dependent forces in high-density hadronic matter, as wellas(iv) problems of baryon spectroscopy.
On top of this, the study of high-density hadronic matter is a special interest for
further experiments at the NICA collider constructing at JINR, Dubna.
Obviously, experiments conducted at J-PARC should be supported by the world-widecommunity as the internationally important projects.
We strongly support the Hadron Experimental Facility Extension Project at J-PARC
and activities of HUA for the project. We believe in a further success in the new
project.
Sincerely yours,
From our team at LHEP of JINR,
Eugene A. Strokovsky, Doctor of science, Professor,
Joint Institute for Nuclear Research, Dubna, Russia,
Laboratory of High Energy Physics (position: Head of the Division 2: physics at the
Nuclotron beams),
and RCNP of the Osaka University, Specially Appointed Professor;
andAlexander Averjanov, scientist,
Joint Institute for Nuclear Research, Dubna, Russia,
Laboratory of High Energy Physics (position: scientist).
23.08.2021

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
The J-PARC Hadron Experimental Facility is research center of world
significance for the study of nuclear, hadron and particle physics. The
new proposal for the Extension of the J-PARC Hadron Experimental
Facility will allow studies of such topical issues of modern hadron
Physics, as the interaction of hadrons containing strange quarks, therole of spin-dependent forces in high-density hadronic matter, as wellas problems of baryon spectroscopy. The study of high-density hadronicmatter is a special interest for further experiments at the NICA
collider constructing at JINR, Dubna.
Obviously, experiments conducted at J-PARC should be supported by thethe world-wide community as an internationally important projects.
It would be our great pleasure to strongly support the Hadron
Experimental Facility Extension Project at J-PARC, and, activities of
HUA for the project.
We believe in a further success in the new project.
Sincerely yours,
Krivenkov Dmitrii, PhD,
20.08.2021
Joint Institute for Nuclear Research, Dubna, Russia.
Laboratory of High Energy Physics, position - head of sector.

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
August 26, 2021
Dear Professor Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We, the KOTO collaboration, appreciates the effort by the task force under the J-PARC
Hadron Hall Usersʼ Association to promote the hadron experimental facility extension project.
We have been discussing the next generation experiment to measure the branching ratio of
the 𝐾"# → 𝜋 # 𝜈𝜈 decay, so-called KOTO step-2, which can be realized in the extended hadronhall. We hope the project can be realized in a timely manner and will provide us opportunities
to conduct world-class experiments.
Sincerely,

Tadashi Nomura
on behalf of the KOTO collaboration
List of the staff members who signed up
Tadashi Nomura (Spokesperson; KEK/J-PARC, Japan)
Yau W. Wah (Co-spokesperson; University of Chicago, USA)
Yee Bob Hsiung (National Taiwan University, Republic of China)
Eun-Joo Kim (Jeonbuk National University, Republic of Korea)
Takeshi Komatsubara (KEK/J-PARC, Japan)
Katsushige Kotera (Osaka University, Japan)
Jong-won Lee (Korea University, Republic of Korea)
GeiYoub Lim (KEK/J-PARC, Japan)
Hajime Nanjo (Osaka University, Japan)
Koji Shiomi (KEK/J-PARC, Japan)
Yasuhisa Tajima (Yamagata University, Japan)
Yu-Chen Tung (National Taiwan University, Republic of China)
Hiroaki Watanabe (KEK/J-PARC, Japan)
Taku Yamanaka (Osaka University, Japan)

Physics Department

Building 510
P.O. Box 5000
Upton, NY 11973-5000
Phone 631.344.5325
etw@bnl.gov
managed by Brookhaven Science Associates
for the U.S. Department of Energy
www.bnl.gov

August 26, 2021
To Whom It May Concern:
I am following with interest the discussion of the Hadron Hall Extension and particularly the proposed
KOTO-2 experiment. I think the extension is well-justified and anticipate that KOTO-2 will have thepotential to make exciting discoveries and will make important contributions to high-energy physics.
I and several of my colleagues at Brookhaven National Lab would be interested in exploring thepossibility of participating in KOTO-2 if this program goes forward.
Kind regards,

Elizabeth Worcester
Physicist, BNL

Prof. Jung Keun Ahn
Department of Physics
Korea University
Seoul, 02841, Korea
Tel:+82-2-3290-3093
email: ahnjk@korea.ac.kr

Prof. Koji Miwa
Tohoku University,
Chair of J-PARC
Hadron Hall
Users’ Association(HUA)

August 27, 2021

Letter of Support
for the Hadron Experimental Facility Extension Project at J-PARC
Dear Koji,
We are pleased to learn that the Hadron Experimental Facility Extension Projectis being proposed to build new secondary beam lines for nuclear, hadron, andparticle physics experiments. The experimental activities at the J-PARC Hadron
Experimental Facility have played significant roles in particle, hadron, nuclear
physics, and their related fields. In particular, the hadron/nuclear physics experiments conducted there have been internationally essential and supported by theworldwide community.
We will be proposing a new experiment with the K1.1 beam line to study lowenergy KN and KN interactions. This new experiment includes a search for thepentaquark state Θ+ in K+ d → K0 pp reaction with the Hyperon Spectrometer.
We will also be heavily involved in the K1.1 physics program, which currently
includes high precision hypernuclear spectroscopy and high-quality hyperonnucleon scattering experiments.
It is our great pleasure to support the Hadron Experimental Facility Extension
Project at J-PARC, and the activities of HUA for proposing the project. We believe
the project, including the newly proposed experiments, is pretty compelling, andwe strongly desire early realization of the project.

Jung Keun Ahn

May 12, 2021

FROM: Dr. Pete Markowitz
TO: J-PARC Hadron Hall Users' Association
RE: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
The activities at the J-PARC Hadron Experimental Facility are important, well-acknowledged andessential for our understanding in the fields of particle, hadron, and nuclear physics, as well as theirrelated fields. The impact of current and planned future measurements should not be underestimated. In particular, we believe that the projects conducted at J-PARC are internationally at theforefront of the field and need further support from the world-wide community. For that reason, it
would be our great pleasure to strongly support the Hadron Experimental Facility Extension Projectat J-PARC, and, activities of HUA for the project. We hope for further success with the new project.
If I can be of further help, please let me know. I can be reached at 305-348- 1710 or
markowit@fiu.edu.
Sincerely
Dr. Pete E.C. Markowitz
Assistant Dean of the Honors College and Professor of Physics

The Honors College – Florida International University
Modesto A. Maidique Campus, DM 233 • Miami, FL 33199 • Tel: 305-348-4100 • Fax: 305-348-2118 • honors.fiu.edu
Florida International University is an Equal Opportunity/Access Employer and Institution • TDD via FRS 1-800-955-8771

OtSV%‘/SMI

ACADEMY OFSCIENCES-STEFAN MEYER INSTITUTE FOR SUBATOMIC PHYSICS

Supporting Letter for the Hadron Experimental Facility
Extension Project at J-PARC

Vienna August 18. 2021

Dear Prof. Koji Miwa, Chair ofJ-PARC Hadron Hall Users‘ Association,

We known that the activities at the J-PARC Hadron Experirnental Facility are weil
acknowledged in particle, hadron, nuclear physics and related fields. In particutar, the projects
conducted at J-PARC detivering important contributions to the world-wide effort in hadron
physics. Therefore, further strong international support ofthese and upcoming experiments isessential.
lt is our great pleasure to strongty support the Hadron Experimental Faciiity Extension
Project at J-PARC, and activities ofHUA for the project.
We hope the project will be realised and we are looking forward to very successful
conducted experiments.

Sincerely

t
-

—

%»

/
Pof. Johann Zmes al

-.

u‘

e\CX‘
$S

Prof. Eberhard Widmann
Prof. Johann Marton

Stefan Meyer Institute for Subato,nic Physics
A ustrian Acaäemv ofSciences
Kegelgasse 27
A-1030 Vienna, A U$TRIA

Phone: +43 1 51581 4500

August 19, 2021

Supporting Letterfor the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University),
Chair of J-PARC Hadron Hall Users' Association (HUA)
Dear Koji,

Fachbereich
Physik, Mathematik und Informatik
Institut für Kernphysik
Prof. Dr.
Patrick Achenbach
Johannes Gutenberg-Universität Mainz
J.-J.-Becherweg 45
D 55099 Mainz
Tel. +49 6131 39-25777
Fax +49 6131 39-22964
achenbach@uni-mainz.de

The experimental activities at the J-PARC Hadron Experimental Facility have played significant roles in particle, hadron, and nuclear physics as well as their related fields. In
particular, the hadron/nuclear physics experiments conducted there have been internationally important and supported by the world-wide community.
It is my great pleasure to support the Hadron Experimental Facility Extension Project at
J-PARC, and the activities of HUA for proposing the project. I believe the project including the newly-proposed experiments are quite compelling and I strongly desire early realization of the project.
In Mainz, we have developed a broad knowledge base in strangeness and hypernuclear physics. In the last decade, a group working at the MAMI electron accelerator was setting up the Kaos spectrometer for performing
strangeness and hypernuclear physics and successful experiments were run in the following years. During this time,a strong cooperation between the groups in Mainz and at Tohoku University was established, students were participating in experiments abroad and common publications were written. In addition, the two groups cooperated at hypernuclear electroproduction experiments at Jefferson Lab in the US. Secondly, a cooperation exists between the
PANDA hypernuclear physics group at the Helmholtz Institute Mainz (HIM) and the J-PARC groups performing
studies on double hypernuclei. A strong link to the group at Kyoto University exists. This research area has evolved
during the last years and the Hadron Experimental Facility Extension Project at J-PARC is a natural, necessary, andtimely future direction. I am confident that the strangeness physics groups in Mainz will participate strongly to andbenefit greatly from the realization of the project.
Sincerely,

August 19, 2021, Prof. Patrick Achenbach, Johannes Gutenberg University Mainz

Goethe-University | 60629 Frankfurt am Main
Depeartment of Physics | Institute for Nuclear Physics

To:
Prof. Koji Miwa (Tohoku University)
Chair of J-PARC Hadron Hall Users' Association (HUA)
Supporting Letter for the Hadron Experimental Facility Extension Project at
J-PARC
Dear Koji,
the experimental activities at the J-PARC Hadron Experimental Facility haveplayed significant roles in particle, hadron, and nuclear physics as well as theirrelated fields. In particular, the hadron and nuclear physics experiments
conducted there have been internationally important and supported by the worldwide community.
It is our great pleasure to support the Hadron Experimental Facility Extension
Project at J-PARC, and the activities of HUA for proposing the project. We believe
the project including the newly-proposed experiments are quite compelling and
we strongly desire early realization of the project.
There are unique measurements proposed at J-PARC, that will provide direct
inside where often modelling or assumptions are needed nowadays.
Especially, the scattering experiments planned to measure the S--p interaction are
absolutely unique since many experiments, e.g. ALICE at LHC, have no possibilty
to reconstruct the S- directly. Furthermore, the precison measurements on the
production of hypernuclei will be suitable to complete our current understanding.
Sincerely,(Dr. Benjamin Dönigus)
Member of the ALICE Collaboration at CERN LHC
Physics Analysis Group Convenor “Nuclei and Exotica” of ALICE (2014-2019)Technical Coordinator of the ALICE Transition Radiation Detector (since 2018)
Personal focus on: Production of loosely bound objects in high-energy collisions
and detector physics
Collaborators:
Members of the ALICE Collaboration
Horst Stöcker, Frankfurt Institute of Advanced Studies (FIAS)Peter Braun-Munzinger, Extrem Matter Institute (EMMI), GSI
Stefania Bufalino, Politecnico of Turin, Department of App. Science & Technology

August 26th 2021
Department of Physics
Institute for Nuclear Physics
Dr. Benjamin Dönigus
Lecturer
Visiting adressCampus Riedberg | Physik-Gebäude
Max-von-Laue-Str. 1
60438 Frankfurt am Main
Mail adress
60629 Frankfurt am Main
Germany
Telefone +49 (0)69 798 47043
Telefax +49 (0)69 798 47100
doenigus@ikf.uni-frankfurt.de
www.uni-frankfurt.deIstituto Nazionale di Fisica Nucleare
SEZIONE DI TORINIO

To:

Prof. Koji Miwa (Tohoku University)
Chair of J-PARC Hadron Hall Users' Association (HUA)

Subject: Letter supporting the Hadron Experimental Facility Extension Project at J-PARC

Dear Koji,

Turin, August 31, 2021

the experimental activities at the J-PARC Hadron Experimental Facility have been playing significant
roles in particle, hadron, and nuclear physics as well as in their related fields. In particular, thehadron/nuclear physics experiments carried out in this laboratory have been of international relevanceand raised the interest of a world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Project at J-PARC, andthe efforts of HUA for proposing the project. We believe that this initiative, including the newly
proposed experiments, is quite compelling and we eagerly wish for its timely realization.
The research Group in Turin enthusiastically looks forward to the important opportunity offered by
the future availability of new facilities dedicated to hadron physics.
As far as our specific research activity is concerned, it would be of paramount importance to continue
and to deepen the studies currently in progress on strangeness nuclear physics, in the framework of
the already well established collaborations with Japanese colleagues.
In particular, the unique and excellent new beam quality makes promising the exploitation of the(π−,K0) reaction, never used before, in order to perform a complete investigation of the weak decay
process of several neutron-rich Λ-hypernuclei.
Sincerely,
Alessandro Feliciello,
INFN – Sezione di Torino,
senior staff researcher,spokesperson of the INFN Collaboration ULYSSES
Michelangelo Agnello,
Department of Applied Science and Technology, Politecnico di Torino and
INFN – Sezione di Torino,
Full Professor
Elena Botta,
Physics Department, Turin University and INFN – Sezione di Torino,
Associate Professor

Stefania Bufalino,
Department of Applied Science and Technology, Politecnico di Torino and
INFN – Sezione di Torino,
Associate Professor
Daniela Calvo,
INFN – Sezione di Torino,
senior staff researcher
Alessandra Filippi,
INFN – Sezione di Torino,
senior staff researcher

Goethe-University | 60438 Frankfurt am Main
Faculty of Physics

To:
Prof. Koji Miwa (Tohoku University)
Chair of J-PARC
Hadron Hall Users' Association (HUA)

August 19th, 2021
Title: Supporting Letter for the Hadron Experimental Facility Extension Project at JPARC
Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played
significant roles in particle, hadron, and nuclear physics as well as their related fields. In
particular, the hadron/nuclear physics experiments conducted there have beeninternationally important and supported by the world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Project at JPARC, and the activities of HUA for proposing the project. We believe the project
including the newly-proposed experiments is quite compelling and we strongly desire an
early realization of the project.
The proposed experiments, in particular on hypernuclei and the interactions of strange
baryons, will be very important for the understanding of the properties of neutron stars.
They will be a decisive complement to the physics program at other facilities, such as
FAIR and NICA, and will provide indispensable data necessary for the interpretation of
future measurements.
Sincerely,

Prof. Dr. Christoph Blume

Seite 1 von 1

Fachbereich 13
PhysikInstitut für Kernphysik
Prof. Dr. Christoph Blume
Campus Riedberg/Physik-Gebäude
Max-von-Laue-Str. 1
60438 Frankfurt am Main
Telefon +49 (0)69 798 47060
Telefax +49 (0)69 798 47046
blume@ikf.uni-frankfurt.de
www.uni-frankfurt.deto Prof. Koji Miwa (Tohoku University),
Chair of J-PARC Hadron Hall Users' Association (HUA)

Supporting Letter for the Hadron Experimental Facility Extension Project at JPARC

Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility haveplayed significant roles in particle, hadron, and nuclear physics as well as theirrelated fields. In particular, the hadron/nuclear physics experiments conducted
there have been internationally important and supported by the world-widecommunity.
With great pride we may say that we participated in a whole series of theexperiments conducted in Hadron Hall (E19, E10, E13, E05 and E40)
It is our great pleasure to support the Hadron Experimental Facility Extension
Project at J-PARC, and the activities of HUA for proposing the project. We believe
the project including the newly-proposed experiments are quite compelling and
we strongly desire early realization of the project.
Sincerely,
Zviadi Tsamalaidze, head of the department LNP JINRPetr Evtoukhovitch, senior researcher LNP JINR

20.08.2021

差出人: Hiroyuki Noumi noumi@rcnp.osaka-u.ac.jp
件名: Fwd: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月18日 15:30
宛先: Miwa miwa9@lambda.phys.tohoku.ac.jp、 Fuminori Sakuma sakuma@ribf.riken.jp---------- Forwarded message --------From: Wen-Chen Chang <changwc@phys.sinica.edu.tw>
Date: 2021年8月18日(水) 15:23
Subject: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Hiroyuki Noumi <noumi@rcnp.osaka-u.ac.jp>
Cc: Wen-Chen Chang <changwc@phys.sinica.edu.tw>

Dear Prof. Koji Miwa,
The activities at the J-PARC Hadron Experimental Facility are wellappreciated in particle, hadron, and nuclear physics, and their related
fields. In particular, we understand that their projects conducted at
J-PARC are internationally important and need further support from theworld-wide community. We are very much delighted to show our strong
support of the Hadron Experimental Facility Extension Project at J-PARC,
and, activities of HUA for the project. We greatly look forward to afurther success of the new project.
Sincerely yours,
Wen-Chen Chang
Institute of Physics, Academia Sinica, Taiwan
Research fellow
2021/8/18=======================================================================
Wen-Chen Chang
Phone(O): 886-2-2789-6794
E-mail: changwc@phys.sinica.edu.tw
Fax(O) : 886-2-2783-4187
URL:https://goo.gl/CahZnc=======================================================================

Technische Universität München | Arcisstraße 21 | 80333 München

Prof. Koji Miwa (Tohoku University)
Chair of J-PARC Hadron Hall Users
Association (HUA)

Place (Munich), 29. August 2021
Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Koji,
I’m a professor in hadron physics at the Technische Universität München and an active memberof the ALICE collaboration at the CERN-LHC and I would like herewith to strongly support theexperimental facility extension project at J-PARC. The experimental activities at the J-PARC
Hadron Experimental Facility have played and are playing a unique role in particle, hadron, andnuclear physics. In particular, the hadron/nuclear physics experiments conducted there havebeen internationally important and supported by the world-wide community.
The quest of the detailed understanding of the strong interaction starting from first principles andextended to strange and charmed quarks represents today the frontier of nuclear physics andprovides important implications for astrophysics as well. The ongoing experiments at J-PARC
provide unique experimental methodologies to address unsolved problems in the field and pave
a new avenue for nuclear physics extended to the strange and charmed sector. Along withemerging new fields linked to solid state and biophysics, the long-standing nuclear physics fieldholds the foundations for the understanding of the building blocks or ordinary and exotic forms ofmatter and hence experimental effort in this direction is of capital importance not only thediscipline of strong interaction itself but also for neighboring fields of research.
It is hence not only my pleasure but also my duty as a scientist to support the Hadron Experimental
Facility Extension Project at J-PARC, and the activities of HUA for proposing the project. I believethat the project including the newly-proposed experiments are quite compelling and extremelycompetitive in their originality and technological realization. This means that the proposed
extension of the experimental facility and planned experiments will be also capable to attract
young and talented scientists to our field and motivate further theoretical studies world-wide.
The experimental program on hadron physics I’m leading at the LHC is deeply entangled tocurrent and future experiments at J-PARC. The complementarity of our approaches provided
fundamental contributions in the field of hadron physics in recent years and I’m looking forward
to the future common challenges.
Technische Universität München
Physik Department
Fachgebiet ‚Dense and Strange
Hadronic Matter’

Prof. Dr. rer. nat.
Laura Fabbietti
James-Franck-Strasse 185748 Garching

Tel. +49 89 289 12 431
Fax +49 89 289 12 435
laura.fabbietti@ph.tum.dehttps://www.denseandstrang
e.ph.tum.de/1/2

Sincerely,

Prof. Dr. Laura Fabbietti

2/2Dr. Catalina Curceanu

www.lnf.infn.it

tel. + 39 06 9403 2321
fax + 39 06 9403 2559
email: Catalina.Curceanu@lnf.infn.it

Frascati, 17th August 2021

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
For more than 20 years the Italian and Japanese teams were collaborating for strangeness physics
studies, both in Italy and in Japan, at the complementary facilities DAFNE (in Italy) and J-PARC(in Japan).
In this context I am the spokesperson of the SIDDHARTA-2 Collaboration performing strangenessstudies at DAFNE and am also leading the Italian LNF-INFN group who is participating at various
experiments at J-PARC hadron hall, among which E15, E57 and E62.
The results obtained at the unique J-PARC Hadron Experimental Facility are very relevant and arebroadly acknowledged by the international community. These results, especially those obtained in
the last several years for studies involving strangeness nuclear interactions, are extremely
important in particle and nuclear physics, as well as in astrophysics (Equation of State of neutronstars, a hot issue, still open).
We believe that the projects conducted at J-PARC are internationally important and, in this context
and with great pleasure we strongly support the Hadron Experimental Facility Extension Projectat J-PARC, and activities of HUA for the project.
If this extension project will be granted, we plan to participate in the experiments and researches
which will be conducted there in the future.
Sincerely,
Dr. Catalina Curceanu

INFN-LNF
Spokesperson of the SIDDHARTA-2 collaboration and leaderof team of LNF-INFN participating to J-PARC experiments

I.N.F.N. / L.N.F. – Via E. Fermi, 40 – I - 00044 Frascati (RM) – Italy

差出人: Samanta, Chhanda samantac@vmi.edu
件名: Hadron Facility Extension Project, and/or the HIHR/K1.1 program
日付: 2021年8月25日 0:18
宛先: miwa9@lambda.phys.tohoku.ac.jp
CC: tamura@lambda.phys.tohoku.ac.jp、 nue@lambda.phys.tohoku.ac.jp

August 24, 2021
Prof. Koji Miwa (Tohoku University),
Chair of J-PARC Hadron Hall Users' Association.
Dear Miwa-san,
I have been working in the field of Hypernuclei (both theory and experiment) for a longtime. Hypernuclear mass measurements can provide important information on
the hyperon-nucleon and hyperon-hyperon force that is essential for understanding
the mass and radius of high density neutron stars as well as primordial strange stars.
Incidentally, a mathematical formula, known as the "Samanta Formula", can predict thebinding energy of a hypernucleus over an wide mass range.
I am a collaborator of several hypernuclear projects at the Jefferson Lab, USA. In thepast I had the privilege of working at J-PARC and RCNP with my esteemed Japanesecolleagues. I am impressed witnessing how the progress of science has been backed by
the progress of technology in Japan.
I fully support the Hadron Facility Extension Project, and/or the HIHR/K1.1 program as
it would add a valuable route for pioneering research work in the field of hypernuclei.
All the best.
Chhanda Samanta-----------------------------------Chhanda Samanta, PHD
Col. & Professor, Dept. of Physics & Astronomy
Virginia Military Institute, Lexington, VA 24450, USA
Ph: 001-(540) 464-7506 FAX: 001-(540) 464-7767-----------------------------------https://scholar.google.com/citations?user=ufCkn8AAAAAJ&hl=en

Chhanda Samanta - Google Scholar​
scholar.google.com
Professor, VMI - ​Cited by 2,400​ Physics​

Reinhard A. Schumacher
Department of Physics
Carnegie Mellon University
5000 Forbes Ave
Pittsburgh, PA 15213
schumacher@cmu.edu

August 24, 2021
Prof. Koji Miwa
Tohoku University
Chair of J-PARC Hadron Hall Users' Association (HUA)
Dear Professor Miwa-san,Allow me to express my strong support for the Hadron Experimental Facility Extension Projectat J-PARC, in particular the experiments aimed at refining our understanding of hypernuclear
states across the periodic table.
I have been associated with experiments at the old BNL/AGS hypernuclear physics program in
the 1980’s and 1990’s, as well as strangeness physics using electromagnetic probes at Jefferson
Lab from the 1990’s until today. I have enjoyed the collaboration with many Japanesecolleagues who have been working at the same facilities. My strongest associations were withKen Imai-san, Toru Iijima-san (now KEK/Belle) and Hiro Tamura-san on the BNL/AGS D-line
experiments searching for the hypothetical H particle. I have visited and tremendously enjoyed
my visits to J-PARC to interact with your colleagues there and to see the excitement generated
by their work.
It is clear to me that hadronic beams are the best way to explore hypernuclear environments,
unlike the electromagnetic probes used at Jefferson Lab. My current research is focused onelectromagnetic probes, but I follow development in the hadronic domain closely in theliterature. You have a unique position at J-PARC to maintain world leadership in the field of
hypernuclear physics using the existing beam lines but also by building out your capabilities in
the hadron hall. From what I read about the HIHR and K1.1 facilities, it looks like you have an
excellent chance to keep this exciting research field moving. The connection of hypernuclear
phenomenology and theory to the physics of dense stellar dynamics is highly interesting toeveryone worldwide. Progress in understanding the YN interaction is central to this effort, andthis is where J-PARC stands out. I support early realization of the project.
Sincerely Yours,
Reinhard Schumacher
Professor of Physics

ç:ÍIP'

Instituto(''

Universidade de São Paulo(j''ll)de Física

ç:ÍIP'

Instituto(''

Universidade(j''ll)Prof. Alberto Martínez Torres,Prof. Alberto de
Martínez
Torres,Departamento
Física Nuclear,
Departamento
deUniversidade
Física Nuclear,
Institutode Física,de SãoInstitutodeFísica,de SãoPaulo, Rua do Matão Universidade
1371, CEP 05508-090
Paulo, Rua do Matão 1371, CEP 05508-090,
de São PauloSão Paulo, Brasilde Física

The present document is to certify that Prof. José Ramón Peláez gave a talkwith title
Sca/aras nor?-ord/na/ymesons at
the Instituteof PhysicsofSupporting
Letterformesonsthe Hadron
Experimental
Facility
Extension
Project
at J-PARC
the University of São Paulo on 12/09/201 9.
Prof. Alberto Martínez Torres,

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users'
Association,
Departamentode Física Nuclear,
Instituto de Física, Universidade de São
Paulo,
Rua do Matão
1371,
CEP 05508-090
It is a pleasure to be writing a letter supporting the hadronexperimental
facility
extension

project at J-PARC. It is well known that the activities at the J-PARC Hadron Experimental
Facility are very important for the progress Sãoin particle,
hadron, and nuclear physics research.
Paulo,12/09/2019
The present atdocument
to certifythat international
Prof. José Ramón
Peláeztalk
The projects conducted
J-PARCis havea highimpactongavethe aworld-wide
with
title
Sca/armesonsasnor?-ord/na/ymesonsattheInstituteofPhysicsof to science.
hadron physics studies and are not only of interest to the physics community, but
the University of São Paulo on 12/09/201 9.
I gladly support the Hadron Experimental Facility Extension Project at J-PARC and I am
certain about its success.

São Paulo, 19 AUGUST 2021
São Paulo,12/09/2019
ALBERTOMARTINEZTORRES

n=:t=da USP

Deptcl de Física Nuelou

ALBERTOMARTINEZTORRESALBERTOMARTÍNEZTORRESn=:t=da USP

Deptcl de Física Nuelou

2104 Physics Building
College Park, Maryland 20742-4111
Tel: 301-405-6117 Fax: 301-405-6114
cohen@physics.umd.edu

DEPARTMENT OF PHYSICS
Maryland Center for Fundamental Physics

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
I write in strong support of the Hadron Experimental Facility Extension Project at J-PARC.
I have been working in hadronic physics as a theorist for more than three and a half decades.
The health of the field depends on new high-quality experimental results which in turndepends on first-rate experimental facilities such as those found at Jefferson Lab in the UnitedStates and at J-Park in Japan. I have followed the research at the J-PARC Hadron
Experimental Facility and they are clearly acknowledged as being of great significance to thehadron physics community, and have clear and fundamental overlaps with nuclear physics,
particle physics and related fields.
Given this situation, I firmly believe that the projects conducted at J-PARC are of importanceinternationally and should be fully supported by the world-wide hadronic physics community.
Thus, I strongly support the Hadron Experimental Facility Extension Project at J-PARC andhope for success in the new project.
Sincerely
Sincerely,

Thomas D. Cohen
Professor
Associate Chair for Graduate Studies

差出人: Craig D. Roberts cdroberts.inp@gmail.com
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月24日 12:08
宛先: takizawa@ac.shoyaku.ac.jp
CC: cdroberts cdroberts@nju.edu.cn

To: Prof. Koji Miwa
Chair of J-PARC Hadron Hall Users' Association,
Dear Prof. Miwa
The research team at the Nanjing University Institute for Nonperturbative Physics (INP) is keenly interested in
activities at the J-PARC Hadron Experimental Facility, which are widely acknowledged as providing world-wide
leadership in particle, hadron, and nuclear physics, and their related fields.
In particular, we believe that their projects conducted at J-PARC are of great international importance andsignificance. Consequently, they would benefit from further support from the world-wide community.
I am therefore pleased to offer the strong backing of NJU-INP and its affiliates to the Hadron Experimental Facility
Extension Project at J-PARC.
We wish this new project a very successful future.
Yours sincerely,
Craig Roberts for the NJU INP--

Craig Roberts
InternationalDistinguished Professor - School of Physics& Head - Institute for NonperturbativePhysics
NanjingUniversity, 22 Hankou Rd, Gulou District
Nanjing, Jiangsu 210093,China
mobile: +86 198 2504 8130
e: cdroberts@nju.edu.cn
w: https://inp.nju.edu.cn/
w: https://sites.google.com/view/cdroberts

Institute of Physics Belgrade
Pregrevica 118, Zemun
11080 Belgrade, Serbia
19th August 2021
Prof. Koji Miwa,
Chair of J-PARC Hadron Hall Users' Association
Tohoku University
Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
Dear Prof. Koji Miwa,
We, the undersigned, have known that the activities at the J-PARC Hadron Experimental Facility are
well acknowledged in particle, hadron, and nuclear physics, and their related fields. In particular, we
believe that the projects conducted at J-PARC are internationally important and need further support
from the world-wide community. It would be my great pleasure to strongly support the Hadron
Experimental Facility Extension Project at J-PARC. I wish J-PARC staff and scientists further successin the new project.
Sincerely

Veljko Dmitrašinović,(dmitrasin@ipb.ac.rs Full Research Professor at the Institute of Physics Belgrade - Elementary Particle
Physics Group).

ADRESSE Universitätsstraße 150 | 44801 Bochum, Germany
ANFAHRT U-Bahn: U35 | Auto: A43, Abfahrt (19) Bochum Witten[Professor Dr. E. Epelbaum Theoretische Physik II]
RUHR-UNIVERSITÄT BOCHUM | Theor. Physik II | 44780 Bochum | Germany

To:
Prof. Koji Miwa (Tohoku University)
Chair of J-PARC Hadron Hall Users’ Association (HUA)

FAKULTÄT FÜR PHYSIKUND ASTRONOMIE
Institut für Theoretische Physik II
Hadronen- und Teilchenphysik
Gebäude NB 6/152
Universitätsstraße 150, 44801 Bochum

PROF. DR. E. EPELBAUM
Fon +49 (0)234 32-23707
Fax +49 (0)234 32-14697
Evgeny.Epelbaum@rub.de
http://www.tp2.rub.de

Ihr Zeichen | Ihre Nachricht vom

Unser Zeichen | Unsere Nachricht vom
Supporting Letter

Datum
24. August 2021

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played significant
roles in particle, hadron, and nuclear physics as well as their related fields. In particular, thehadron/nuclear physics experiments conducted there have been internationally important andsupported by the world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Project at J-PARC,
and the activities of HUA for proposing the project. We believe the project, including the newlyproposed experiments, are quite compelling and we strongly desire early realization of the
project.
Sincerely,

Prof. Dr. Evgeny Epelbaum
Chair in Theoretical Physics at Ruhr University Bochum

ADRESSE Universitätsstraße 150 | 44801 Bochum, Germany
ANFAHRT U-Bahn: U35 | Auto: A43, Abfahrt (19) Bochum Witten

差出人: <fkguo@itp.ac.cn>
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at
J-PARC
日付: 2021年8月19日 22:29:24 JST
宛先: <hosaka@rcnp.osaka-u.ac.jp>
CC: 邹冰松 <zoubs@itp.ac.cn>

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users'
Association,
We have known that the activities at the J-PARC Hadron
Experimental Facility are well acknowledged in particle, hadron, andnuclear physics, and their related fields, and have madewell-recognized important contributions. In particular, we believe that
their projects conducted at J-PARC are internationally important andneed further support from the world-wide community. It would be ourgreat pleasure to strongly support the Hadron Experimental Facility
Extension Project at J-PARC. I hope a further success in the new
project.
Sincerely yours,
Feng-Kun Guo (Professor, Institute of Theoretical Physics, Chinese
Academy of Sciences)Bing-Song Zou (Professor, Institute of Theoretical Physics, Chinese
Academy of Sciences)
August 19, 2021--------------------------Dr. Feng-Kun Guo
Professor
Institute of Theoretical Physics, CAS
Zhong Guan Cun East Street 55
100190 Beijing, China

Prof. Koji Miwa

24 August 2021

Tohoku University
Chair of J-PARC Hadron Hall Users' Association (HUA)
miwa9@lambda.phys.tohoku.ac.jp

Re: Supporting Letter for the Hadron Experimental Facility Extension Project at
J-PARC
Dear Koji,
The experimental program carried out at the J-PARC Hadron Experimental Facility has
played a significant role in particle, hadron, and nuclear physics as well as in theirrelated fields. In particular, the hadron/nuclear physics experiments conducted at JPARC have made a substantial impact internationally and have been supported by theworld-wide community.
It is with great pleasure that we write to support the Hadron Experimental Facility
Extension Project at J-PARC, and we applaud the role of the HUA in proposing the
project. This project, including the proposed experiments, is quite compelling, and weurge an early realization of the project.
The proposed HIHR/K1.1 beam line is of utmost importance to making progress inunderstanding the structure of neutron stars. To that end it is essential that we haveprecision hypernuclear data that vet our models. The effort required to solve what you
have labeled as the “hyperon puzzle” is enormous. You are proposing to create thelaboratory data base required to extrapolate beyond nuclear densities to solve the"neutron star hyperon puzzle". The extensive NN data base and myriad nuclear
spectroscopic data have established that sophisticated two-body nucleon force models
cannot alone provide the basis for robust Equation of State (EoS) models of nuclear
matter at high density. In non-relativistic Hamiltonian models, the addition of threenucleon forces is required to generate EoS models that support neutron stars of morethan 2 solar masses (and having a radius of the order of 10 km), which have now been
observed. However, in such dense neutron matter hyperons are certain to appear,
which will soften the EoS. Model calculations confirm that idea when two-body
hyperon-nucleon forces are included, strongly suggesting that our rudimentary

hyperon-nucleon force models are incomplete. Indeed, hyperon-nucleon scattering
data are sparse as are hypernuclear spectroscopic data. Resolving the neutron star
hyperon puzzle requires extensive hyperon-nucleon scattering data as well as
hypernuclear spectroscopic data, so that our hyperon-nucleon force models can beextended to include 3-body hyperon-nucleon forces just as nucleon-nucleon force models
were expanded as the nucleon-nucleon scattering data base and nuclear spectroscopic
data were made precise by extensive experimental measurements. J-PARC can do for
hypernuclear physics that which took decades for the world to accomplish forconventional nuclear physics.
To be clear, the hyperon-nucleon (YN) scattering program at higher energies isessential to modeling the Equation of State that one needs to model the structure ofneutron stars. It is only through such investigations that we can develop knowledge ofthe short-range properties of the YN interaction. Without that knowledge we cannot
accurately model the Equation of State at the matter densities which we can probe in
the laboratory. The matter density within a neutron star can be several times thematter density that we can explore in the laboratory. Our Equation of State fromlaboratory measurements must extrapolate a significant "distance" to neutron star
matter. Thus, it is imperative that we understand as much as feasible about nuclear
matter which we can investigate in the laboratory. Your experimental program toinvestigate hypernuclear structure as a function of A up to ^{208}Pb will play a crucialrole.
Let us turn to the light hypernuclei and the need for precision YN scattering data. A
data base for YN scattering comparable to that which exists for NN scattering isessential to provide the underpinning or basis for our understanding of the YN
interaction that will permit robust modeling of hypernuclei including YNN forces, justas we are now able to model nuclei in the conventional, strangeness = 0 domain.
Because we have no 2-body YN bound states, the hypertriton will play a role in
the Lambda-nucleon (LN) sector similar to that of the deuteron in the NN sector.
Therefore, it is important that we measure precisely the ^3_LH Lambda-separationenergy and the poles of the T=0 and T=1 excited states. Those observables along with
the LN scattering lengths will constrain the YN interaction models just as the deuteronbinding energy and the pp, nn, and np spin-singlet scattering lengths constrain the NN
interaction models. Connection to such work at JLab as measuring the Lnn
observables will be necessary to paint a full picture of the A=3 YNN physics. Modelingof the A=4 and A=5 Lambda-hypernuclei will be essential to our beginning tounderstand the YNN interaction within a given hyperon-nucleon force model. (This isanalogous to the path taken in the NN+NNN domain to constrain the T=1/2
NNN interaction by calculating the A=3 and A=4 nuclear binding energies. One is able
to constrain the longer-range attractive component of the 3-body force.) Thus, precisionexperimental measurements of the A=4 and A=5 Lambda-hypernuclei boundstate energies are essential to solving the "hyperon puzzle".

We wish you every success in bringing this project to fruition.
Sincerely,

Benjamin F. Gibson

Iraj R. Afnan

Los Alamos National Laboratory

Flinders University

Los Alamos, NM, USA

Adelaide, SA, Australia

andEditor, Physical Review C
CC: Hiro Tamura

tamura@lambda.phys.tohoku.ac.jp

Nue Nakamura nue@lambda.phys.tohoku.ac.jp

差出人: Haidenbauer, Johann j.haidenbauer@fz-juelich.de
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月25日 16:00
宛先: Koji Miwa miwa9@lambda.phys.tohoku.ac.jp
Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users'
Association (HUA)
August 24, 2021

Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played
significant roles in particle, hadron, and nuclear physics as well as their related
fields. In particular, the hadron/nuclear physics experiments conducted there havebeen internationally important and supported by the world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Projectat J-PARC, and the activities of HUA for proposing the project. We believe the project
including the newly-proposed experiments are quite compelling and we strongly desire
early realization of the project.
Of specific interest to our group in Bonn/Jülich is certainly the planned
HIHR/K1.1 program. In particular, we expect that the measurements to be performedat the K1.1 beam-line are going to revolutionize our knowledge on the Lambda-protoninteraction at low and medium energies. While so far only integrated cross sections(and with low statistics) are available, the proposed experiment will allow accessto differential observables and even to spin-dependent quantities. Suchobservables pave the way for gaining a much better insight into the dynamics
of the Lambda-proton interaction. They will be rather helpful for achieving asubstantial improvement of the description of the hyperon-nucleon forces in terms ofchiral effective field theory, a model-independent approach to baryon-baryon forces
employed by our group.
Also the HIHR program is very interesting for us. We are happy to see that thisexperiment is designed to cover a rather wide range of Lambda hypernuclei including
also fairly light systems with atomic numbers in the range of A=6-9. Such light
hypernuclei are amenable to the so-called ab initio treatment that our grouppursues for some time, which allows a principally exact evaluation of theproperties of those hypernuclei directly from the underlying (hyperon-nucleon)
two-body forces as well as with inclusion of possible (hyperon-nucleon-nucleon)
three-body forces.
We consider covering also heavier hypernuclei as an important
additional aspect of the program. This data will provide additional constraints
on the hyperon-nucleon and hyperon-nucleon-nucleon interactions at higher densities
that are important for a reliable application to hyperonic nuclear matter.
Sincerely,
Prof. Ulf-G. Meißner
HISKP and BCTP
University of Bonn
D-53115 BonnandInstitute for Advanced Simulation
Forschungszentrum Jülich GmbHD-52425 Jülich
Dr. Johann Haidenbauer
Dr. Hoai Le
Dr. Andreas Nogga
Institute for Advanced Simulation
Forschungszentrum Jülich GmbHD-52425 Jülich

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Forschungszentrum Juelich GmbHForschungszentrum Juelich GmbH52425 JuelichSitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Volker Rieke
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),Karsten Beneke (stellv. Vorsitzender), Dr. Astrid Lambrecht,
Prof. Dr. Frauke Melchior-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Ben Gibson

7 月 12 日(月) 9:39

Dear Hiro, Koji, & Nue,
I have previously written about how important your program at J-PARC on
the proposed HIHR/K1.1 beam line is to making progress in understanding thestructure of neutron stars. To understand neutron stars it is essential that wehave precision hypernuclear data that our models can reproduce. In listening
to the discussions at the workshop last week, I wondered how well nonexperts
in hypernuclear physics will understand the effort required to solve what you
have labeled as the hyperon puzzle. It seems to me that you are trying tocreate the laboratory data base required to extrapolate beyond nuclear
densities to solve the "neutron star hyperon puzzle". At least as I followed thepresentations supporting the HIHR/K1.1 beam line program, one issaying: The extensive NN data base and myriad nuclear spectroscopic data
have established that sophisticated two-body nucleon force models alone
cannot alone provide the basis for robust Equation of State (EoS) models of
nuclear matter at high density. In non-relativistic Hamiltonian models, theaddition of three-nucleon forces is required to generate EoS models that
support neutron stars of more than 2 solar masses (and having a radius of theorder of 10 km), which have recently been observed. However, in such dense
neutron matter hyperons are certain to appear, which will soften the
EoS. Model calculations confirm that idea when two-body hyperon-nucleon
forces are included, strongly suggesting that our rudimentary hyperon-nucleon
force models are incomplete. Indeed, hyperon-nucleon scattering data aresparse as are hypernuclear spectroscopic data. Resolving the neutron star
hyperon puzzle requires extensive hyperon-nucleon scattering data as well as
hypernuclear spectroscopic data, so that our hyperon-nucleon force models canbe extended to include 3-body hyperon-nucleon forces just as nucleon-nucleon
force models were expanded as the nucleon-nucleon scattering data base andnuclear spectroscopic data were made precise by extensive experimental
measurements. J-PARC can do for hypernuclear physics that which took
decades for the world to accomplish for conventional nuclear physics.
Best regards,

Ben

Ben Gibson bfgibson@earthlink.net

2021/06/28 7:21

Dear Hiro, Koji, and Nue,
My apology for the delay in continuing the discussion of the importance of the"Physics at J-PARC
HIHR/K1.1 beam lines" program. The YN scattering program at higher energies
is essential to modeling the Equation of State that one needs to think about thestructure of neutron stars. It is only thru such investigations that we can develop
knowledge of the short range properties of the YN interaction. Without thatknowledge we cannot accurately model the Equation of State at the matter
densities which we can probe in the laboratory. The matter density within aneutron star can be several times the matter density that we can explore in thelaboratory. Our Equation of State from laboratory measurements must
extrapolate a significant "distance" to neutron star matter. Thus, it is imperativethat we understand as much as feasible about nuclear matter which we caninvestigate in the laboratory. Your experimental program to investigate
hypernuclear structure as a function of A up to ^{208}Pb will play an importantrole.
Kind regards,
BenVidana Isaac isaac.vidana@ct.infn.it

6 月 19 日(土) 15:43

To Satoshi, Koji, Hirokazu
Dear Hiro
Unfortunatelly. today I will only be able to attend the first talks, because I havea family committment. I am very sorry. I send you, however, my personal list ofwishes for the hypenuclar EoS and particularly for the solution of the hyperon
puzzle.
- More YN (hopefully also YY) scattering data (This is highly desireable)- More & updated hypernuclear data (specially in medium?heavy hypernuclei)- Measurements of multi-strange hypernuclei- Study of light hypernuclei to determine the role of hyperonic TBFs
Others:- Lattice QCD calculations- Analysis of hyperon-hyperon correlations in HIC- More astronomical data sensitive to the strangeness content of NS
Best regards
Isaac

Prof. Dr. Horst Lenske <horst.lenske@physik.uni-giessen.de>
6 月 17 日(木) 18:39

Dear Hiro, dear Nue, and Koji,
These are two impressive projects! The proposals are addressing two highly needed,
important, and interesting experiments! Both experiments are on the forefront of
nuclear research. They’ll give the great chance to enlarge tremendously andimprove the data bases for YN interactions not only in free space but also in nuclei.
The polarization measurements are clearly urgently needed in order to encircle thespin-dependent interaction terms. I wonder what kind of surprises will be
detected…for example about the tensor interaction which for Lambda-n should bestrongly suppressed according to our generally accepted expectations!
As you state correctly in the YA proposal, the whole sector of in-medium hyperon
interactions is poorly understood - if at all! If goes further into the details, thepicture behind YNN forces becomes a much richer and more divers structure: Since
the Lambda does mit couple directly to the pion, the usual mechanism assumed asleading order for NNN 3-body forces via Delta(1232)-excitation fails. As an
isosinglet particle the Lambda will couple to isoscalar mesons, hence 2-pion “sigma”
exchange will be the leading order contribution - apart from minor, probably
negligible, contribution by the eta-meson. In either case, for the Lambda the N*mechanism is restricted to the N*(1440) Roper-resonance and other I=1/2
resonances at even higher masses. However, for the Sigma and Cascade hyperons
the situation resembles much more the one encountered for nucleons. Since theseare I=1 and I=1/2 states they are coupled easily to the kind of diagrams known
from NNN-interactions.
Thus poses an interesting question: if for the Lambda-A interaction considerable inmedium modifications are observed they are more likely to originate frompolarization effects. If so, the Lambda might be considered as a perfect probe to
study induced interactions.
The energy-momentum ranges covered by the experiments will certainly not allow toaccess the quark core of baryons. So, arguments based on pure QCD-properties
should be used with great care.

By lack of time (and expertise ;)!) I did not read the sections on the design of theexperiments. Anyway, the physics cases behind the proposals are so strong andconvincing that I’m pretty sure of their success. They will give a strong boost to
strangeness physics, establishing J-Parc as a prime facility in that field.
Wishing you an exciting workshop, best
Horst

Weise, Wolfram weise@tum.de

4 月 17 日(土) 21:23

Dear Hiro and colleagues,
your proposed themes for the projected HIHR/K1.1 beam lines sound and look indeedpromising!
I will most probably be available during at least parts of the week starting June 14, withthe exception of June 16. Please keep me informed about the LOI and the further steps
you are preparing.
Best regards,
Wolfram差出人: Jorge Segovia jsegovia@upo.es
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月21日 15:55
宛先: miwa9@lambda.phys.tohoku.ac.jp、 miwa@nh.scphys.kyoto-u.ac.jp
CC: Feliciano de Soto fcsotbor@upo.es、 Pepe Rodriguez-Quintero jose.rodriguez@dfaie.uhu.es、Jose Manuel Morgado Chávez jmorgado1@us.es

Dear Prof. Kouji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We have known that the activities at the J-PARC Hadron Experimental Facility, being one of the very few places
having at its hand secondary meson beams, are well acknowledged in particle, hadron, and nuclear physics, andtheir related fields. In particular, we believe that their projects conducted at J-PARC are internationally important andneed further support from the world-wide community. It would be our great pleasure to strongly support the Hadron
Experimental Facility Extension Project at J-PARC; in particular, the hadron studies related with conventional mesons
and baryons but also exotic matter such as multiquark systems.
I hope for further success in the new project, whose documentation has been meticulously prepared by the working
group of the Hadron Experimental Facility Extension Project at J-PARC, and with the feedback of the international
community through a series of workshops.

Sincerely
August 21st, 2021,
University Pablo de Olavide, in Seville, Spain, Prof. Dr. Jorge Segovia (jsegovia@upo.es)
University Pablo de Olavide, in Seville, Spain, Prof. Dr. Feliciano de Soto
University of Huelva, Spain, Prof. Dr. José Rodriguez-Quintero
University of Huelva, Spain, Dr. José Manuel Morgado-Chávez

DEPARTAMENTO DE FÍSICA
Rua São Nicolau 210 5º Andar - Bairro Centro - Diadema
SP CEP 09913-030
http://www.unifesp.br

Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
The projects carried out at the J-PARC Hadron Experimental Facility are well-known to thecommunity of strong interaction physics. I, my colleagues and the students in our group,for example, regularly follow the papers and letters of intent from J-PARC. The studies
held at the J-PARC facility bring valuable information to the community, which isinternationally discussed and deserves worldwide support. It is a pleasure for me to write
this letter and strongly support the Hadron Experimental Facility Extension Project at JPARC. I wish a further success in the new project.
Sincerely,
Kanchan Khemchandani.

August 19 2021,
Professor Kanchan Khemchandani,
Federal University of São Paulo,
Brazil.

 Inst. für Theoretische Physik ▪ Heinrich-Buff-Ring 16 ▪ D-35392 Gießen

Institut für Theoretische Physik

Prof. Koji Miwa (Tohoku University),
Chair of J-PARC Hadron Hall Users' Association(HUA)

Prof. Dr. Dr. habil. Horst Lenske
Heinrich-Buff-Ring 16
D-35392 Gießen
Tel.: 0641 / 99 – 33311/33361
Fax.: 0641 / 99 – 33339
Email: horst.lenske@physik.uni-giessen.deAz. :24. August 2021

Betreff: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
Dear Koji,
With excitement and interest I took notice of the extension project at J-PARC. Strangeness physics
has become of high actuality. Hypernuclear physics is an essential part of the research programs at
international facilities from JLAB in the US to MAMI@Mainz and practically all experiments being
under construction at the upcoming new FAIR@GSI laboratory. In the era of multi-messenger
astronomy and in view of the unexpected observations of the production of light hypernuclei in heavy
ion experiments at RHIC@Brookhaven and LHC@CERN strangeness physics has become in recent
years a key issue for understanding the equation of state of highly compressed matter and theevolution of compact stellar objects on their path to formation of black holes.
As a convener and a member of the board of representatives of the NUSTAR experiment, a memberof the theory advisory group of PANDA, and co-initiator of the European project THEIASTRONG2020 I am being deeply involved in this flourishing and rapidly expanding research field. I
am writing this letter of support for the extension of the J-PARC facility out of strong enthusiasm forthe exciting physics program which will strengthen further the traditional strong position of Japanese
hypernuclear and strangeness physics research, establishing J-PARC at a top position for at least
the next decade.
The challenging and demanding projects have the potential to dominate these research areas inmany important aspects. As one of the key examples, I emphasize in particular the plannedexperiments on hyperon-nucleon scattering data, including spin-observables. Presently, the whole
field relies on about 40 (!) data points of poor statistical quality from the 1960ies. The proposed worldwide unique – collection of experiments will enlarge and solidify the data base tremendously,
becoming a corner stone of strangeness and hypernuclear physics. Together with the also
envisioned investigations of single- and multi-strangeness hypernuclei for the first time a consistent
set of validated data will be available. These data will allow e.g. to explore and solve the longstanding and controversially debated “hyperon puzzle” of neutron star physics, relying strongly on
our understanding of hyperon interactions in a dense nuclear medium. Moreover, the data will be of
extremely high relevance for the exploration of SU(3)-flavour physics in the octet sector and beyond.

I strongly support the J-PARC extension project and recommend with explicit emphasis therealization of the project in full. I am convinced that the international nuclear physics community will
highly appreciate the achievements once this outstanding project is delivering results.
With best regards,

Prof. Dr. Horst Lenske

差出人: Prof. Dr. Horst Lenske horst.lenske@physik.uni-giessen.de
件名: Re: Could you please write a supporting letter for J-PARC (HIHR/K1.1) project ?
日付: 2021年8月19日 17:58
宛先: Hirokazu TAMURA tamura@lambda.phys.tohoku.ac.jp
CC: Koji Miwa miwa9@lambda.phys.tohoku.ac.jp、 Satoshi N. Nakamura nue@lambda.phys.tohoku.ac.jp
Dear Koji, Nue, and Hiro,
It will be a great pleasure to support your projects. Best
Horst
Vom iPhone gesendet
Am 18.08.2021 um 18:49 schrieb Hirokazu TAMURA <tamura@lambda.phys.tohoku.ac.jp>:

Dear participants in the J-PARC HIHR/K1.1 Workshop,
Thank you for your interest and support for the strangenessnuclear physics program at J-PARC HIHR/K1.1 beam lines
planned to be built in the J-PARC Hadron Facility Extension
Project.
We have recently prepared the 3rd White Paper for the J-PARC Hadron
Facility Extension Project (see below).
Then, a focused review committee of the project was formed
under the J-PARC PAC, in which we made presentations last week:
https://kds.kek.jp/event/38930/
The committee wants to know how many experimentalists and theorists
are supporting the project.
To receive better evaluation, we need to collect many supporting lettersfor the project from collaborators and supporters, in particular from abroad.

We appreciate it very much if you and your colleagues could support the project(the Hadron Facility Extension Project, and/or the HIHR/K1.1 program),
express it as supporting letters, and send the letters via e-mail.
We do not mind the letter format. But, for your convenience, we attach a templateof the letter below. Feel free to modify it as you wish.

Please sent it to:Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users' Association,
miwa9@lambda.phys.tohoku.ac.jp
with CC to: tamura@lambda.phys.tohoku.ac.jp and nue@lambda.phys.tohoku.ac.jp
at your earliest convenience (but by the end of next week when the committee will write conclusions).
Thank you again for your support.
Best regards,
Koji Miwa, Nue Nakamura, and Hiro Tamura--------------------------------------------------------------------------＊The 3rd White Paper for the J-PARC Hadron Facility Extension Project:
Chapt.1
https://drive.google.com/file/d/1WB_UZzP3uVUvnIh2KfQFd90iTuxYeECA/view?usp=sharing
Chapt.2
https://drive.google.com/file/d/1-bKAhhRvQ_zefmANuNUCkbpzj68iAYw4/view?usp=sharing
Chapt.3
https://drive.google.com/file/d/15USg4U2oRx4QbuA09fTJsT9nn-KoHhF7/view?usp=sharing＊Proposals of experiments submitted to J-PARC PAC
P84(HIHR):
https://drive.google.com/file/d/12LEES20n3SP4gMsYC21D6anMD18dgD4e/view?usp=sharing

https://drive.google.com/file/d/12LEES20n3SP4gMsYC21D6anMD18dgD4e/view?usp=sharing
P85(K10):
https://drive.google.com/file/d/1khvR0F2TSb7uUBKmfUyJNJa1qHqyynVp/view?usp=sharing
P86(K1.1):
https://drive.google.com/file/d/1oUbuWaFNTl39pCJy-1Z50MPLjAgCZHEE/view?usp=sharing==================================================
Hirokazu Tamura
田村 裕和
Dept.of Physics, Tohoku University,

東北大学理学研究科物理 (原子核物理)

Aramaki, Aoba-ku, Sendai 980-8578, Japan 980-8578 仙台市青葉区荒巻字青葉
TEL: +81-22-795-6454 FAX: +81-22-795-6455==================================================<Support_letter_template.docx>

差出人: 耿立升 lisheng.geng@buaa.edu.cn
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月19日 19:16
宛先: miwa9@lambda.phys.tohoku.ac.jp
CC: tamura@lambda.phys.tohoku.ac.jp、 nue@lambda.phys.tohoku.ac.jp
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,

As my recent research interets include hyperon-nucleon and hyperon-hyperon interaction, I have realized more that the activities
at the J-PARC Hadron Experimental Facility are well acknowledged in particle, hadron, and nuclear physics, and their related
fields. In particular, I believe that your projects conducted at J-PARC are internationally important and need further support fromthe world-wide community. It would be my great pleasure to strongly support the Hadron Experimental Facility Extension Projectat J-PARC. I hope a further success in the new project, via which we will understand better the world we live and the role
strangeness plays.

Sincerely

Lisheng Geng, Professor of Physics
Beihang University
August 19, 2021

Department of Physics
Hunan Normal University
Changsha, 410081, China

Supporting Letter for the Hadron Experimental Facility
Extension Project at J-PARC
Dear Prof Koji Miwa,
Chair of J-PARC Hadron Hall Users' Association,
I have known that the activities at the I-PARC Hadron Experimental Facility are wellacknowledged in particle, hadron, and nuclear physics, and their related fields. In
particular, I believe that their projects conducted at J-PARC are internationally
important and need further support from the world-wide community. It would be mygreat pleasure to strongly support the Hadron Experimental Facility Extension Projectat J-PARC. I hope a further success in the new project.
Sincerely yours,

G;-~ Lu
Associate professor Qi-Fang Lil
Department of Physics, Hunan Normal University
Lushan Road 36, Yuelu District, Changsha, 410081, China
Email: lvqifang@hunnu.edu.cn
Aug. 20th, 2021

Rez/Prague, August 27, 2021

Prof. Koji Miwa (Tohoku University)
Chair
J-PARC Hadron Hall Users' Association (HUA)

Letter of support for
the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Miwa,
The J-PARC Hadron Experimental Facility belongs to the world-leading
physics laboratories. It has been playing an important role in particle,
hadron, and nuclear physics, as well as in related fields. The hadron and(hyper)nuclear physics experiments conducted there have been contributing
significantly to our better understanding of hadrons, hadronic systems andtheir interactions. Therefore, they have been always strongly supported by
the world-wide community of experimentalists and theorists.
It is our great pleasure, as well as in our own interest, to support the Hadron
Experimental Facility Extension Project at J-PARC, and the activities of HUA
directed towards proposing the project. We find the project highly
compelling and we strongly desire its early realization including eagerly
awaited newly-proposed experiments.
Our group of hypernuclear and hadron physics has been established by late
J. Zofka, L. Majling, and M. Sotona in the eighties. Since then, it has been
contributing to the development of the field by studying strangenessproduction, structure and decay of hypernuclei, as well as other systems
involving strange hadrons, in close international collaboration, where
physicists from Japan - theorists as well as experimentalists - have played an
important role.
At present, we explore the structure of light Λ hypernuclei including
underlyingΛN andΛNN interactions; the nature of Λnn and 3ΛH*(3/2+);

charge symmetry breaking in

hypernuclei; lightest double-Λ hypernuclei;

C
o
l
u
m
n
3
2
1

decay of hypertriton; production and structure of heavier hypernuclei.
Members of our group are also active in studying meson-nucleon andmeson-nuclear interactions. For our calculations new, more precise data arebadly needed, such as data from the γ-ray spectroscopy measurements of
the hypertriton planned at the J-PARC K1.1 beamline, direct information on
the spin dependence ofthe ΛN interaction from the planned scatteringexperiments with polarized Λ hyperons or higher accuracy of measured
spectra of heavier Λ hypernuclei. For our group, the planned experiments ondetermining the ΣN scattering length and the formation of (not yet
observed) η and η′ nuclear bound states are of the highest interest as well.
It is thus clear that we wish the Hadron Experimental Facility Extension
Project at J-PARC success and look forward indeed to new, high-quality data
provided by the experiments under consideration.
Sincerely,

Jiri Mares
Department of Theoretical Physics
Nuclear Physics Institute CAS
25068 Rez, Czech Republic
on behalf of my colleagues from our group:
P. Bydzovsky
P. Bruns
A. Cieply
D. Gazda
J. Hrtankova
D. Petrellis
M. Schaefer
N. Shevchenko
D. Skoupil
P. VeselySupporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Koji Miwa,
Chair of J-PARC Hadron Hall Users' Association.

In recent years I have learned that the activities at the J-PARC Hadron Experimental Facility are wellrecognized in particle, hadron, and nuclear physics, and their related fields. This can be seen in thecorresponding research results reported in the leading physics journals during the last years.
Especially, I believe that the experimental projects conducted at J-PARC are internationally importantand require further support from the international community. Therefore, it is a great pleasure for me
to strongly support the Hadron Experimental Facility Extension Project at J-PARC. With the extensionof these projects, I am sure to see further successes made by experimentalists and theorists working
at the Hadron Experimental Facility at J-PARC in the future.

Sincerely yours.
Depok, August 20, 2021

Prof. Dr. rer. nat. Terry Mart
Professor of Physics,
Departemen Fisika, FMIPA,
Universitas Indonesia,
Depok 16424, Indonesia
Email: terry.mart@sci.ui.ac.id
Homepage: https://physics.ui.ac.id/terry-mart/差出人: Lutz, Matthias m.lutz@gsi.de
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
日付: 2021年8月21日 16:15
宛先: takizawa@ac.shoyaku.ac.jp

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
the activities at the J-PARC Hadron Experimental Facility are well acknowledged in particle, hadron, and nuclear
physics, and their related fields. In particular, I believe that the projects conducted at J-PARC are internationally
important and deserve further support from the world-wide community. It is my great pleasure to strongly support the
Hadron Experimental Facility Extension Project at J-PARC.
Sincerely,
Matthias F.M. Lutz---------------------------------------------------Prof. Dr. Matthias F.M. Lutz---------------------------------------------------GSI Helmholtzzentrum für Schwerionenforschung GmbH
Planckstraße 164291 Darmstadt
Telefon: 06159-71-2758---------------------------------------------------Institut fuer Kernphysik
Technische Universitaet Darmstadt
Schlossgartenstr. 2
D-64289 Darmstadt

Department of Physics
College of Natural Sciences
Kyungpook National University
Daehak-ro 80, Buk-gu, Daegu 41566, KOREA

20, August, 2021
Yongseok Oh, Ph.D
Professor
Department of Physics
Kyungpook National University
Daegu 41566, Korea
Email: yohphy@knu.ac.kr

Prof. Koji Miwa
Chair of J-PARC Hadron Hall Users' Association
Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Koji Miwa,
I have known that the activities at the J-PARC Hadron Experimental Facility are wellacknowledged worldwide in particle, hadron, and nuclear physics, and their related fields.
In particular, we believe that their projects conducted at J-PARC are very timely andinternationally important, and need further support from the world-wide community as
well as from the Japanese government. It would be my great pleasure to strongly support
the Hadron Experimental Facility Extension Project at J-PARC and I am willing tocontribute to the success of this project. I hope a further success in the new project.
Sincerely yours,

Yongseok Oh
Department of Physics
Kyungpook National University
Daegu 41566, Republic of Korea

TEL: +82-53-950-5316, FAX: +82-53-952-1739, http://physics.knu.ac.kr

GOBIERNODE ESPAÑAMINISTERIODE ECONOMIA YCOMPETITIVIDAD

Eulogio Oset
Miembro del IFIC
Catedrático de Fı́sica Teórica
Universidad de Valencia

IFIC - INSTITUTO DE FISICA
CORPUSCULAR

Letter in support of J-PARC

Teléfono: +34 96 3543525
Fax:+34 96 3543488
E-mail: oset@ific.uv.es

21 de Agosto de 2021
Supporting Letter for the Hadron Experimental Facility Extension Project at JPARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users’ Association:
The activities at the J-PARC Hadron Experimental Facility are well acknowledged in particle,
hadron, and nuclear physics, and their related fields. The findings at the Lab have brought
new insight into the structure of new states highly debated in the hadron and nuclear physics
communities. In particular, we believe that the projects conducted at J-PARC are internationally important and need further support from the world-wide community. It is my great
pleasure to strongly support the Hadron Experimental Facility Extension Project at J-PARC
and express my hopes for further success of the new project.
Sincerely

Eulogio Oset
Miembro del IFIC
Catedrático de Fı́sica Teórica
Universidad de Valencia

Edificio Institutos de Investigación. Apartado de Correos 22085. E-46071 València. España.

From: Professor Qiang Zhao (Deputy Director)
Theoretical Physics Division
Institute of High Energy Physics
Chinese Academy of Sciences
Beijing 100049
P.R. China
Tel: 0086-10-88236578
Email: zhaoq@ihep.ac.cn
August 20, 2021

To: Professor Koji Miwa
Chair of J-PARC Hadron Hall Users' Association
Title: Supporting Letter for the Hadron Experimental Facility Extension Projectat J-PARC
Dear Prof. Koji Miwa,
I am writing this supporting letter intending to express my strongest support of
the Hadron Experimental Facility Extension Project at J-PARC.
The activities at the J-PARC Hadron Experimental Facility have covered abroad range of exciting topics in particle, hadron, and nuclear physics, and theirrelated fields. So far, our community has benefitted many importantmeasurements and crucial results from the Hadron Experimental Facility at JPARC which are advancing our understanding of fundamental aspects within
the strong interacting nuclear systems. We believe that these projects conducted
at J-PARC are internationally important and need further support from theworld-wide community. Thus, it would be my great pleasure to strongly
support the Hadron Experimental Facility Extension Project at J-PARC and I’dwish a continuous success of this new project.

Yours sincerely,

Qiang Zhao

Departament de Física Quàntica i
Astrofísica and ICC

Facultat de Física
C/ Martí i Franquès, 1
08028 - Barcelona

Tel. +34 934 039 192
angels.ramos@ub.edu
http://www.icc.ub.edu

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users' Association (HUA)
Dear Koji,
I have been following with extreme interest the experimental activities carried out at the J-PARC
Hadron Experimental Facility for many years, as they have greatly contributed to the advance ofparticle, hadron, and nuclear physics, also having a tremendous influence in other fields such as
astrophysics and cosmology. The experiments in hadron and nuclear physics conducted at J-PARC
have been of upmost importance to understand basic science, have brought solutions to problems
that had remained unresolved in the field for many years, and have raised interesting new questions
that need to be understood. The international community regards with high respect and admiration
the J-PARC achievements that have been made possible thanks to the characteristics of the Hadron
Facility itself, but also thanks to the effort of a large and well-trained community of physicists withsolid international connections. I would like to emphasize that the field of strangeness nuclear
physics would not exist without the experimental efforts that have been conducted at J-PARC during
the past years.
Having this precedent in mind, with this letter I would like to give a strong and convinced support to
the Hadron Experimental Facility Extension Project at J-PARC, and the activities of the HUA for
proposing the project. I believe that this Extension Project will establish J-PARC as the place hosting
the best facility in the world to learn about the physics lying in the border of particle and nuclear
physics. The capabilities of the proposed beam lines (high intensity, high resolution) will be unique inthe world, and the dedicated experiments that can be conducted there will bring new light into stillunresolved problems, as clearly explained in the proposal. Characterizing the spin-dependence of thehyperon-nucleon interaction, obtaining its dependence with the nuclear density, learning about the
doubly strange baryon-baryon force… are just a few examples of the very relevant information thatcan be obtained at the proposed facility and, as a theorist, I am eager to contrast the hypotheticalnew data with theoretical models and lattice simulations, thereby contributing to the advance in thegeneration of knowledge in the fields of hadron and nuclear physics.
I believe the project and the newly proposed experiments are of upmost importance for theinternational community, given the fact that other hadron facilities are either reaching the end of
their lifetime (DAPHNE@FRASCATI) or are not fully dedicated to hadron/nuclear physics problems(Jlab, LHCb,…). The research activities conducted in the Hadron and Nuclear Theory group at the
University of Barcelona will greatly benefit from the outcomes of such a Facility and we are looking
forward to establishing ties and collaborations with the groups conducting the experiments there.
Sincerely,

Angels Ramos
Professor of Physics(on behalf of the Hadron and Nuclear Theory group of the University of Barcelona)
Barcelona, August 24, 2021

Lyon, September 6, 2021
Prof. Koji Miwa
Chair of J-PARC Hadron
Users’ Association

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
Dear Prof. Koji Miwa

We have known that the activities at the J-PARC Hadron Experimental Facility are well acknowledged in particle, hadron, and nuclear physics, and their related fields. In particular, we believethat their projects conducted at J-PARC are internationally important and need further support
from the world-wide community. It would be my great pleasure to strongly support the Hadron
Experimental Facility Extension Project at J-PARC. I hope a further success in the new project,that will stimulate international collaborations around this physics.
Yours very sincerely,

Jean-Marc Richard
Professeur à l’Université Lyon 1,
Institut de Physique des 2 Infinis de Lyon,
4, rue Enrico Fermi,
69622 Villeurbanne cedex
e-mail : j-m.richard@ipnl.in2p3.fr
phone : +33 4 72 44 84 39

Theoretical High Energy Physics

Faculty of Science
Radboud University
Institute for Mathematics,
Astrophysics, andParticle Physics

To: Prof. Koji Miwa (Tohoku University), Chair of J-PARC
Hadron Hall Users’ Association (HUA)

P.O. Box 9010
6500 GL Nijmegen
The Netherlands
Telephone +31 (0)24 36 52982
Fax +31 (0)24 36 52120
E-mail t.rijken@science.ru.nl
www.theorphys.science.ru.nl

Our Ref.

Your Ref.

Subject

Direct n

Persona

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC and the HIHR/K1.1 program
Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played a significant rolein particle, hadron, and nuclear physics as well as their related fields. In particular, the hadron/nuclear
physics experiments conducted there have been internationally important and supported by the worldwide community.
It is our great pleasureto support the Hadron Experimental Facility Extension Project at J-PARC, andthe activitiesof HUA for proposing the project. We believe the project including the newly-proposed
experiments are quite compelling and we strongly desire early realization of the project.
Accurate measurements of ΛP and ΣP differential cross sections will lead to a determination of the
P-waves in particular. This will be very important for establishing the hyperon-nucleon two-body interactions. The Λ−, Σ− nucleon interaction plays a key role in establishing the baryon-baryon interactions
because via SU3-symmetry it has impact on the nucleon-nucleon, cascade-nucleon, etc. interactions.
Sincerely yours, Prof. Dr. Th.A. Rijken

THE UNIVERSITY OF CHICAGO
THE ENRICO FERMI INSTITUTE
5640 S OU T H ELLIS A V ENU E
CHICA G O · ILLINOIS 60637-1433

August 26, 2021
Prof. Koji Miwa, Chair
J-PARC Hadron Hall Users’ Association
Dear Professor Miwa :I am writing in support of the planned extension of the Hadron Experimental Facility at J-PARC. I have admired Japan’s particle physics program for many
years, having served on the Lepton Collider Program Advisory Committee during
1999-2004 and the Roadmap Advisory Committee in 2008. It is a great pleasure to
see the variety of physics that J-PARC will be able to address with the envisioned
extension.
The proposed program has three major thrusts, each focused on criticalproblems in particle physics. (1) Strange quarks can soften a neutron star’s equation of state, reducing the upper limit on its mass. However, neutron star mergers
detected by LIGO indicate that some neutron stars can exceed that limit. Thisis the “hyperon puzzle,” to be addressed by intensive studies of nuclei contaiting
one or more strange quark. (2) Recent dtudies of strange and charmed baryons
have broadened the applicability of the quark model, allowing descriptions similar
to the semi-empirical formula for nuclear isotope masses. These approaches areripe for experimental study. (3) Rare kaon decays can probe the standard model(SM) with unprecedented accuracy, limited only by the available proton flux. My
colleague Yau Wah has spoken highly of his experience in searching for the decay
KL → π 0 ν ν̄ at J-PARC, and looks forward to reaching SM sensitivity with theupgrade’s help.
J-PARC can foresee a bright future with the proposed extension, taking its
rightful place as a world leader on the Intensity Frontier of particle physics.
Sincerely,

Jonathan L. RosnerProfessor of Physics

August 23, 2021, Genoa, Italy
Title: Supporting Letter for the Hadron Experimental Facility Extension Project at JPARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We have known that the activities at the J-PARC Hadron Experimental Facility are wellacknowledged in particle, hadron, and nuclear physics, and their related fields. In
particular, we believe that their projects conducted at J-PARC are internationally importantand need further support from the world-wide community. It would be my great pleasure tostrongly support the Hadron Experimental Facility Extension Project at J-PARC. I hope afurther success in the new project.
Sincerely

Prof. Elena Santopinto
INFN, Sezione di Genova,
via Dodecaneso 33
I-16146 Genova, Italy

Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
the activities at the J-PARC Hadron Experimental Facility in particle, hadron, and nuclear physics, and their related
fields are internationally highly regarded in their respective communities. Therefore, it is of utmost importance thatthe projects conducted at J-PARC receive further support from theworld-wide community. It is my great pleasure to strongly support the Hadron Experimental Facility Extension
Project at J-PARC. I wish you continued success with the new project.
Sincerely yours,
Prof. Dr. Stefan Scherer
Institute for Nuclear Physics, Johannes Gutenberg University
Mainz, Germany
24 August 2021

file:///C/Users/sakuma/Desktop/20210826_1931/Theory_Scherer.txt[2021/08/27 21:57:21]

差出人: Seung-il Nam <gariwulf@gmail.com>
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at
J-PARC
日付: 2021年8月19日 22:15:27 JST
宛先: Atsushi Hosaka <hosaka@rcnp.osaka-u.ac.jp>
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We have known that the activities at the J-PARC Hadron Experimental Facility are
well acknowledged in particle, hadron, and nuclear physics, and their related fields.
In particular, we believe that their projects conducted at J-PARC are internationally
important and need further support from the world-wide community. It would be mygreat pleasure to strongly support the Hadron Experimental Facility Extension
Project at J-PARC. I hope for further success in the new project.
19th August 2021
Pukyong National University (Korea),
Seung-il Nam (Associate professor)
Sang-Ho Kim (Research professor)
Hatauruk Parada (Research professor)

Department of Physics, Yonsei University
Professor Su Houng Lee
Department of Physics
Yonsei University
Yonsei-ro 50, Seodaemun-Gu
Seoul 03722, Korea
August 20 2021
Prof. Koji Miwa
Chair of J-PARC Hadron Hall Users' Association
Dear Prof. Miwa
We have known that the activities at the J-PARC Hadron Experimental Facility are wellacknowledged in particle, hadron, and nuclear physics, and their related fields. In particular,
we believe that their projects conducted at J-PARC are internationally important and needfurther support from the world-wide community. J-PARC Hadron experiments and thephysics probed by the users are unique, pioneering and of utmost importance for theunderstanding of current puzzles in nuclear and particle physics. Their activities andextension project will solidify their role as the world leading focal point in these endevour.
It would be my great pleasure to strongly support the Hadron Experimental Facility Extension
Project at J-PARC. I hope a further success in the new project.
Sincerely

Su Houng Lee
email:suhoung@yonsei.ac.kr

1

Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users'
Association (HUA)
Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played
significant roles in particle, hadron, and nuclear physics as well as their related fields.
In particular, the hadron/nuclear physics experiments conducted there have beeninternationally important and supported by the world-wide community.
It is my great pleasure to support the Hadron Experimental Facility Extension Projectat J-PARC, and the activities of HUA for proposing the project. We believe the project
including the newly-proposed experiments are quite compelling and we strongly desire
early realization of the project.
I am particularly interested in the proposed studies of the strange systems. These
include proposals of new experiments with K mesic atoms, Lambda- proton scatteringand search of nuclear states of K mesons. Myself, I have been working in this field andrelated fields for a long time. Recently, I have been attached to AMADEUS project at
INCN / Frascati Laboratory. The latter Laboratory is a kind of J-PARC collaborator as anumber of experimental colleagues participate and plan to participate in the proposed
experiments. It is also a competitor and that reflects a healthy situation of the field.
In addition, I wish to add some personal remarks. I joined experiment PUMA at
CERN, which aims to create antiprotonic atoms with unstable nuclei. It originated inJapan ( RIKEN) and is currently materializing in Europe. In both fields, I have worked
with Japanese scientists and I have been impressed by their knowledge and their
passion. I wish this is offered a chance to continue.
Another aspect of my joy is hyper-nuclear physics, which originated in my country
with the first findings of a single and double hyper-nucleus. It now thrives in Japan andis a source of pride for Japanese physicists.
Sincerely,
Slawomir Wycech,
Professor, National Institute for Nuclear Research , Theory Division, Warsaw, Poland
19 August 2021

Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played
significant roles in particle, hadron, and nuclear physics as well as their related fields.
In particular, the hadron/nuclear physics experiments conducted there have beeninternationally important and supported by the world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Projectat J-PARC, and the activities of HUA for proposing the project. We believe the project
including the newly-proposed experiments are quite compelling and we strongly desire
early realization of the project.
We have been working on the theoretical study of hypernuclear low-lying states, fromwhich, we are aimed to determine hyperon-nucleon (YN) interaction. The YN interaction
is currently poor constrained. More data are required to improve our understanding on
the YN interaction which plays an important role in the neutron stars.
Sincerely,
August 19, 2021
Prof. Jiangming Yao
School of Physics,
Sun Yat-sen University,

THE l '.':I\.ERSlTY OF

TENNESSEEKNOX\'lLLE

Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University), Chair ofJ-PARC Hadron Hall Users' Association (HUA)

Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played significant
roles in particle, hadron, and nuclear physics as well as their related fields. In particular, thehadron/nuclear physics experiments conducted there have been internationally important andsupported by the world-wide community.
It is my great pleasure to support the Hadron Experimental Facility Extension Project at J-PARC,
and the activities of HUA for proposing the project. The project includes newly-proposed,
extremely compelling, novel and forward-looking experiments, uniquely suited for the proposed
facility.
I support most strongly the earliest possible realization of the project.

Sincerely,

Jirina Rikovska Stone

August 19, 2021

Professor of Physics (Adjunct)
Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA
Academic Visitor
Department of Physics (Astrophysics) University of Oxford, Oxford, UK
Visiting Scientist
Strangeness Nuclear Physics Laboratory
RIKEN, Nishina Center for Accelerator-Based Physics, Japan

Department of Physics and Astronomy
40 I Nielsen Physics Building, Knoxville, TN 37996-1200
865-974-3342

865-974-7843 fax

www.phys.utk.edu

BIG ORANGE. BIG IDEAS.
UI'

Anthony W Thomas AC FAA, FAIP, CSci, F Inst P
Elder Professor of Physics
Director: Adelaide Node of CoEPP and CSSM
Department of Physics
University of Adelaide
Adelaide SA 5005 AUSTRALIA
Telephone +61 8 8313 3547
Facsimile +61 8 8313 3551
anthony.thomas@adelaide.edu.au

Prof. Koji Miwa (Tohoku University),
Chair J-PARC Hadron Hall Users' Association
20th August 2021
Re: Hadron Experimental Facility Extension Project at J-PARC
Dear Professor Miwa,
As a member of the J-PARC PAC I have been privileged to see the plans for a number of
new experiments that would be made possible by building this extension. I am particularlyinterested in the new capabilities to explore the properties of nuclei containing strange
baryons, such as the cascade and the capacity to define hyperon-nucleon forces.
I would like to express my strong support for this exciting new initiative at J-PARC. This
laboratory has already shown that the high quality of the facilities and the professionalism of
the staff can attract many overseas researchers, leading to important new insights into nuclear
and particle physics. The Hadron Hall Extension will dramatically enhance those capabilities.
Yours Sincerely

Anthony W Thomas差出人: atitov@theor.jinr.ru
件名: Supporting Letter for the Hadron Experimental Facility
J-PARC
日付: 2021年8月21日 22:18:06 JST

Extension Project at

宛先: "Atsushi Hosaka" <hosaka@rcnp.osaka-u.ac.jp>
Supporting Letter for the Hadron Experimental Facility Extension Projectat J-PARC
Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association,
We have known that the activities at the J-PARC Hadron Experimental
Facility are well acknowledged in particle, hadron, and nuclear physics, and theirrelatedfields. In particular, we believe that their projects conducted at J-PARC are
internationally important and need further support from the world-widecommunity. It would be my great pleasure to strongly support the Hadron
Experimental
Facility Extension Project at J-PARC. I hope a further success in the new project.
Sincerely,
09/17/2021
Chief Researcher
Professor, Doctor of Physics and Mathematics
Bogoliubov Laboratory of Theoretical Physics,
Joint Institute for Nuclear Research(International Intergovernmental Organization),
Dubna, Russia

Ins!tute ofSpace Sciences
Campus UAB, c. Can Magrans s/n,
08193 Bellaterra, Barcelona
Phone: +34 937 379 788
ice@ice.csic.es - http://www.ice.csic.es

Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users' Association (HUA)
Dear Koji,
The experimental activities at the J-PARC Hadron Experimental Facility have played significant roles inparticle, hadron, and nuclear physics as well as their related fields. In particular, the hadron/nuclear physics
experiments conducted there have been internationally important and supported by the world-widecommunity.
It is my great pleasure to support the Hadron Experimental Facility Extension Project at J-PARC, and theactivities of HUA for proposing the project. I believe the project including the newly-proposed experiments
are quite compelling and I strongly desire early realization of the project.
Sincerely,

Barcelona, 30 August 2021
Dr. Laura Tolos
Institute of Space Sciences (CSIC-IEEC) and University of Stavanger

http://www.ice.csic.es/

Title: Supporting Letter for the Hadron Experimental Facility Extension Project at J-PARC

Dear Prof. Koji Miwa, Chair of J-PARC Hadron Hall Users' Association:
We are indeed aware that the activities at the J-PARC Hadron Experimental Facility
are very important, have contributed, and will continuously contribute well for particle,
hadron, and nuclear physics, as well as the related fields.
In particular, we believe that the projects conducted at J-PARC are internationally important,and need further support from the world-wide communities.
It would be our great pleasure to strongly support the Hadron Experimental Facility Extension
Project at J-PARC.
We do hope a further success in the new project.

Sincerey, Kazuo, João Pacheco, Bruno, and Gilberto.

São Paulo, Brazil, August 22, 2021,
Laboratório de Física Teórica e Computacional – LFTC
Universidade Cidade de São Paulo (UNICID), andUniversidade Cruzeiro do Sul

Prof. Dr. Kazuo Tsushima

Prof. Dr. João Pacheco B. C. de MeloProf. Dr. Bruno El-Bennich

Prof. Dr. Gilberto T. F. Ramalho

Universidade versidade Cidade de São Paulo
Pinheiros  Liberdade Tatuapé
www.unicid.edu.brSupporting Letter for the Hadron Experimental Facility Extension Project at J-PARC
To: Prof. Koji Miwa (Tohoku University), Chair of J-PARC Hadron Hall Users'
Association (HUA)
Dear Prof. Koji Miwa,
The experimental activities at the J-PARC Hadron Experimental Facility have played
significant roles in particle, hadron, and nuclear physics as well as their related fields. In
particular, the hadron/nuclear physics experiments conducted there have beeninternationally important and supported by the world-wide community.
It is our great pleasure to support the Hadron Experimental Facility Extension Project at
J-PARC, and the activities of HUA for proposing the project. We believe the project
including the newly-proposed experiments are quite compelling and we strongly desire
early realization of the project.
Hadron/nuclear physics experiments play a crucial role in the understanding of thestructure of compact stars. During the last years it has become more and more clear thatthe possible production of hyperons at the center of compact stars have a deep impact on
the structure of those stellar objects. It has been argued hyperonic three-body forces canpotentially solve the so-called hyperon puzzle, namely the difficulty in reaching large
neutron star masses if hyperons are present in their interior. By tunning those interactions
it is possible to reach and exceed 2Msun while allowing the formation of hyperons in thestar. On the other hand, in order to claim that hyperons can really be formed in the coreof a compact star it is fundamental to have the support of experimental data. From thispoint of view the Hadron Experimental Facility Extension Project at J-PARC, and theactivities of HUA is crucial since it can provide the basic information to develop realistic
models for nuclear dynamics at the core of compact objects.
For all these reasons I strongly support the Hadron Experimental Facility Extension
Project at J-PARC, and the activities of HUA for proposing the project. It is importany
both for the hadron/nuclear physics community and for the nuclear physics/astrophysics
groups.
Sincerely,Dr. Isaac Vidaña
Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Italy
Catania, August 23rd 2021

差出人: Weise, Wolfram weise@tum.de
件名: J-PARC Hadron Experimental Facility Extension
日付: 2021年8月25日 2:23
宛先: miwa9@lambda.phys.tohoku.ac.jp
CC: tamura@lambda.phys.tohoku.ac.jp、 nue@lambda.phys.tohoku.ac.jp、 Weise, Wolfram weise@tum.de

Dear colleagues,
this message is written expressing my strongest support for the Hadron
Experimental Facility extension project at J-PARC. As a former member of the JPARC Program Advisory Committee (2012-2018), I had the privilege of
witnessing the outstanding developments that established the Hadron Facility asa leading hadron physics laboratory worldwide. The previous successful
experiments at that facility helped identify and promote key questions andissues of fundamental physics for the future in three major areas: strangenessnuclear physics (from hypernuclei to the quest for strangeness in the core ofneutron stars); hadron structure (special focus on baryons with strange andcharm quarks); and rare kaon decays (exploring physics beyond the limits of theStandard Model).
I share the enthusiasm for these topics with many of my European colleagues,
including those of a very active younger generation of experimentalists andtheorists who are part of the STRONG-2020 consortium funded by a major EU
grant. I am very much convinced that there will be strong and dedicated interest
from the European side in the future physics program of the extended Hadron
Experimental Facility, and I wish you and the Japanese hadron physics
community all the best of success in the forthcoming process.
Sincerely,
Wolfram Weise
Prof. Dr. Wolfram WeiseTUM Emeritus of Excellence
Physics Department
Technical University of Munich
85748 Garching, Germany
weise@tum.de差出人: "Shi-Lin Zhu" <zhusl@pku.edu.cn>
件名: Supporting Letter for the Hadron Experimental Facility Extension Project at
J-PARC
日付: 2021年8月20日 9:22:23 JST
宛先: "Atsushi Hosaka" <hosaka@rcnp.osaka-u.ac.jp>
CC: "Shi-Lin Zhu" <zhusl@pku.edu.cn>
Chair of J-PARC Hadron Hall Users' Association
Dear Prof. Koji Miwa,
The activities at the J-PARC Hadron Experimental Facility are well acknowledgedin particle, hadron, and nuclear physics, and their related fields. In particular, theprojects conducted at J-PARC are internationally important and need further
support from the world-wide community. It would be my great pleasure to strongly
support the Hadron Experimental Facility Extension Project at J-PARC. I hope afurther success in the new project.
Sincerely yours,
Shi-Lin Zhu
Director, Institute of Theoretical Physics, Peking University
Changjiang Scholar, Ministry of Education
2021-08-20---------------------------------PS: Atsushi, I don't have Koji Miwa's email address. Please forward
my letter to him. Thanks a lot.