Progress on J-PARC
Hadron Physics,
Nov.30-Dec.2, 2014

Experiments of StrangenessNuclear Physics at J-PARC
Tomofumi NAGAE (Kyoto University)

ContentsIntroduction of J-PARC
E19 : Search for penta-quark Θ+6

E10 : Search for Neutron-rich hypernucleus ΛH-E15 & E27 : Search for ”K pp” →T. Hashimoto & Y. Ichikawa
Future program(E13→H. Tamura)(E07→H. Ekawa and others)
E05 : Spectroscopy of S=-2 systems
SummaryLinacJ-PARC Facility(KEK/JAEA）
South to North

3 GeV
Synchrotron
Neutrino Beams(to Kamioka)

50 GSyn eVchrotron
CY2007 Beams
JFY2008 Beams
JFY2009 Beams

Materials and Life
Experimental
Facility

Photo in July of 2009

Hadron Exp.
Facility3

Hadron Experimental Hall
World highest intensity Kaon beams !

First beam in Feb. 2009
60m x 56m
SKS

ProductionK1.8BR
target (T1)30~50 GeV
Primary Beam

K1.8
hHig

K1.1

KLK1.1BR

strnocni(pn)oitucSuccessful data taking of E19 inusing pion beam
Oct. - Nov. 20102010/10/5~272 hours

2009/10/23

2010/11/4~40people~40 people from KEK, Kyoto, Tohoku, Tokyo, Nara WU, Osaka, JAEA, UNM, INFN,FromKEK,KyotoU.,Tohoko
Torino, Seoul, ITEP, JINR U.,U.Tokyo,NaraWU,OsakaU.,JAEA, UNM(USA),

World Facilities in the 21stCentury For Strangeness Nuclear Physics
HI, π, anti-p
GSI/FAIR
Mainz(e,e’K+)
DA&NE(K-,π-)

J-PARC(K-,K+), (K-,π-)JLab(e,e’K+)

SNP Program History
2010: Oct.-Nov.
--

E19: Penta-quark search in π p→K X at 1.92 GeV/cFirst physics data taking in Hadron Hall
2012: Feb. , after the Earthquake--E19: π p→K X at 2 GeV/c
2012: June++-E27: d(π ,K ) for K pp , a pilot run

5 kW / 270 kW

SNP Program History
2012: Dec.

10 kW

E10: (π-,K+)6ΛH
2013: March - May20 kW

E15: 3He(K-,n) for K-pp
Radiation Accident
E13: Hypernuclear γ-ray spectroscopy; 4ΛHe, 19ΛF

±Beams at K1.8: π → K
π x10^614

K- x10^6
SX Power (kW)E1010010.5

750

E273.5

E19303.35101520202010.10 2012.2 2012.6 2012.12 2013.1 2015.2 2015.5 2017.4

E19 :+Search for penta-quark Θ

J-­‐PARC	  E19	  Collabora0on

Our	  Approach	  	  (	  J-­‐PARC	  E19	  )1. Pion	  induced	  reac0on	  π− +	  p	  →	  K− +	  Θ+Complementary	  to	  photo-­‐produc0on	  (LEPS/CLAS).
Expect	  sizable	  produc0on	  cross	  sec0on.	  =>	  High	  sta0s0cs

2. High	  resolu0on	  missing	  mass	  spectroscopy– K1.8	  beam	  line	  &	  SKS	  :	  	  ΔM	  =	  2	  MeV	  (FWHM)
Previous&experiment
KEK#PS&E522

ΔM&~&13.4&MeV&&(FWHM)&2.6σ

Conclusive	  result	  by	  higher	  sensi0vity	  !!

E19 Experimental	  setup

J-­‐PARC	  	  K1.8
Dedicated to the (π,K) reaction spectroscopyπ−	  beam
eV/c
1.92/2.01	  G

Results

π− + p → K− + X

pπ = 1.92 GeV/c
E19-1stShirotori et al., PRL 109, 132002 (2012).

•••

pπ = 2.01 GeV/c
E19-2ndMoritsu et al., PRC 90 (2014) 035205.

Missing	  mass	  of	  (π,K)	  @	  sca\ering	  angle:	  2—15	  deg	  (Lab)	  No	  peak	  structure	  was	  observed.	  
2nd	  run	  has	  wider	  acceptance	  than	  1st	  run.

Upper	  limit	  for	  Θ+	  produc0on	  cross	  sec0on
An	  example	  of	  ﬁcng	  result

Signal: Gaussian with fixed experimental
width.
B.G.: 2nd order polynomial

Ficng	  results	  of	  each	  mass
Upper	  Limit	  (90%C.L.)p✓Upper limit for differential cross section averaged from 2 to 15 deg:	  	  	  	  	  	  <	  0.28	  µb/sr	  @	  1.50	  –	  1.56	  GeV/c2	  This	  limit	  is	  an	  order	  of	  magnitude	  smaller	  than	  that	  of	  KEK-­‐E522.

Summary	  of	  E19J-­‐PARC	  E19	  is	  a	  pentaquark	  Θ+	  search	  experiment	  with	  high	  sta0s0cs	  and	  high	  resolu0on.	  
π− p	  →	  K−	  Θ+	  reac0on
J-­‐PARC	  K1.8	  B.S.	  and	  SKS	  Result	  of	  E19-­‐1st	  and	  2nd	  run	  was	  presented.	  	  No	  peak	  structure	  was	  observed	  in	  MM	  spectrum.
Upper	  limit	  for	  Θ+	  produc0on	  cross	  sec0on	  was	  obtained	  to	  be	  0.28	  µb/sr	  @	  1.50	  –	  1.56	  GeV/c2	  Upper	  limit	  on	  Θ+	  decay	  width	  was	  also	  discussed.	  
Comparing	  with	  theore0cal	  calcula0on,	  at	  most	  decay	  width	  should	  be	  less	  than	  0.36	  and	  1.9	  MeV	  for	  JP	  =	  ½+	  and	  ½-­‐,	  respec0vely.
This	  is	  extremely	  small	  as	  width	  of	  hadron	  resonance.

E10 :
Neutron-Rich Hypernuclei

J-PARC E10 collaboration
M. Agnello, J.K. Ahn, S. Ajimura, Y. Akazawa, N. Amano, K. Aoki, H.C. Bhang,
N. Chiga, M. Endo, P. Evtoukhovitch, A. Feliciello, H. Fujioka, T. Fukuda,
S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, S.H. Hwang, Y. Ichikawa,Y. Igarashi, K. Imai, N. Ishibashi, R. Iwasaki, C.W. Joo, R. Kiuchi, J.K. Lee,
J.Y. Lee, K. Matsuda, Y. Matsumoto, K. Matsuoka, K. Miwa, Y. Mizoi, M. Moritsu,T. Nagae, S. Nagamiya, M. Nakagawa, M. Naruki, H. Noumi, R. Ota, B.J. Roy,P.K. Saha, A. Sakaguchi, H. Sako, C. Samanta, V. Samoilov, Y. Sasaki, S. Sato,
M. Sekimoto, Y. Shimizu, T. Shiozaki, K. Shirotori, T. Soyama, H. Sugimura,T. Takahashi, T.N. Takahashi, H. Tamura, K. Tanabe, T. Tanaka, K. Tanida,A.O. Tokiyasu, Z. Tsamalaidze, M. Ukai, T.O. Yamamoto, Y. Yamamoto,S.B. Yang and K. Yoshida
Politecnico di Torino, Pusan National University, RCNP, Tohoku University,KEK, Seoul National University, Osaka University, JINR, INFN,
Kyoto University, Osaka Electro-Communication University, JAEA, BARC,
Virginia Military Institute, RIKEN

derplograLaerea!

xeun

Glue-like role of Λ hypernuclei

2	Expand hypernuclearchart by using new
2014.3.12
spectroscopic tools

Production reactions
Missing-mass spectroscopyNon-CX reactions (NCX)(K-,π-), (π+,K+)

Single CX reactions (SCX)(e,e’K+)
thin target available(K-,π0), (π-,KS)

DCXSCX

new spectrometer

Double CX reactions (DCX)(π-,K+), (K-,π+)access neutron-rich hypernuclei
L. Majling NP A585 (1995) 211c

possible with existing setup
very low cross section !
roughly 1/1000 of NCX

J-PARC E10

6Mixing and n-rich hypernucleus ΛH
Possible observation of mixing effect in 6ΛH structure
Prediction of Akaishi
Normal ΛN interaction (“glue” effect)
BΛ ~ 4.4 MeV
Coherent ΛN-ΣN mixing
BΛ ~ 4.4 + 1.4 MeV
Y. Akaishi and T. Yamazaki, Frascati Phys. Ser. XVI (1999) 59

Prediction of Gal and Millener
Coherent ΛN-ΣN mixing
ΔBΛN-ΣN ~ 0.1 MeV
A. Gal and D.J. Millener, Phys. Lett. B 725 (2013) 445

Structure of 6ΛH should be investigated experimentally

Studies of Neutron-rich Hypernuclei (2)DAΦNE (FINUDA)
M. Agnello et al. PRL 108 (2012) 042501.
6Li(stopped K-,π+) reaction
measure also weak decay
cut on T(π+)+T(π-)

3 events of candidates
2.9±2.0×10-6/(stopped K-)−

6K + Li → π+6+Λ H

6− 6Λ H → π + He

+(π ,K ) Reaction Mechanism
Two-step reaction
00

π + p → K + Λ, K + p → K + n−0+0

π + p → π + n, π + p → K + Λ−+pion beam momentum 1.05 GeV/ 1.2 GeV/cc
Theory Harada et al. ~1.6 nb/sr ~1.2 nb/sr

One-step reaction
π + p → K + Σ , ( Σ p ) → ( Λn )−+−−pion beam momentum 1.05 GeV/ 1.2 GeV/cc5.4 nb/sr
Theory Harada et al. 2.4 nb/sr

I=0

Λ

IA≠0I=1

ΣIA≠0

It is important to study ΛN-ΣN mixing for DCX reaction

E10 Experimental Setup•K1.8 Beam Analyzer✓-1.2GeV/c π- Beam
✓Δp/p ~3.3×10-4•SKS Spectrometer✓0.9GeV/c scattered K+✓Δp/p~1.0×10-3✓dΩ = 120 msr•Target✓6Li (95.54% enriched)✓C and (CH2)nResults : Missing-mass spectrum•

Select scattering angle from
2 deg to 14 deg <- Noacceptance ambiguity•

In the missing mass region
around 4ΛH+2n , no peakstructure was observed.

•If the production crosectionis ~10nb/sr, the eventsshould be measured morethan 60 events.

Data does not favor FINUDA’s data.

Discussion•

6Li(π-,K+) reaction populates 1+ state of 6

6Li(1+) atH←
Λforward angle• It needs spin-flip to generate 0+ state• In the case of Scenario-1,2, width of 1+ state is narrow(Gal and Millener).
• → We can not find any narrow peak structures.
• In the case of scenario-3, wave function is broad.
• If states existed, it would not be detected (Hiyama).

Summary of E10
6-+

Successfully Performed the measurement of Li(π ,K )reaction at pπ- = 1.2 GeV/c.
6-+In the missing-mass spectrum of Li(π ,K ) reaction, nosignificant peak was observed.
An upper limit of production cross section wasestimated to be 1.2 nb/sr.
It indicates that 0+ and 1+ states are unbound if crosssection is about 10 nb/sr.
Need reconsideration of 6ΛH structure

E15 & E27

J-PARC
E15Collaboration
The J-PARC E15 collaboration

2T. Hashimoto@SOTANCP3, May 29, 2014

Prog. Theor. Exp. Phys. 2013, 00000 (8 pages)
DOI: 10.1093/ptep/0000000000

J-PARC E27 Collaboration

Inclusive spectrum of the d(π +, K +) reaction
at 1.69 GeV/c
Yudai Ichikawa1,2 , Tomofumi Nagae1 , Hyoungchan Bhang3 , Stefania Bufalino4 ,Hiroyuki Ekawa1,2 , Petr Evtoukhovitch5 , Alessandro Feliciello4 , Hiroyuki Fujioka1 ,Shoichi Hasegawa2 , Shuhei Hayakawa6 , Ryotaro Honda7 , Kenji Hosomi2 ,Kenichi Imai2 , Shigeru Ishimoto8 , Changwoo Joo3 , Shunsuke Kanatsuki1 ,Ryuta Kiuchi2 , Takeshi Koike7 , Harphool Kumawat9 , Yuki Matsumoto7 ,Koji Miwa7 , Manabu Moritsu10 , Megumi Naruki1 , Masayuki Niiyama1 ,Yuki Nozawa1 , Ryota Ota6 , Atsushi Sakaguchi6 , Hiroyuki Sako2 , Valentin Samoilov5 ,Susumu Sato2 , Kotaro Shirotori10 , Hitoshi Sugimura2 , Shoji Suzuki8 ,Toshiyuki Takahashi8 , Tomonori Takahashi11 , Hirokazu Tamura7 ,Toshiyuki Tanaka6 , Kiyoshi Tanida3 , Atsushi Tokiyasu10 , Zviadi Tsamalaidze5 ,Bidyut Roy9 , Mifuyu Ukai7 , Takeshi Yamamoto7 and Seongbae Yang3
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
2ASRC, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan3
Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
4INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Torino, I-10125 Torino, Italy
5
Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russia
6
Department of Physics, Osaka University, Toyonaka 560-0043, Japan
7
Department of Physics, Tohoku University, Sendai 980-8578, Japan
8High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan
9
Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, India
10
Research Center for Nuclear Physics, Osaka 567-0047, Japan
11
RIKEN, Saitama 351-0198, Japan∗E-mail: yudai@scphys.kyoto-u.ac.jp

New type of Strange matter
Strange Mesons (K, K-) in nuclei
Excitation Energy(MeV)

5000 A-1

400300Ξ ⊗ [Z]
A-1
Ξ -⊗ [Z+1]
A-2

ΛΛ⊗

[Z]

200

(K ,K )(K , π ), ( π ,K )(K , π ), (π ,K )(K ,N)_0A
K ⊗ [Z]- AK ⊗ [Z+1]-+-+-+--++-

K- MesonsuA-1Σ+⊗ [Z-1]
0 A-1
Σ ⊗ [Z]- A-1
Σ ⊗ [Z+1]π- ⊗A [Z+1]A-1Λ⊗100[Z]0A

S =-2 Nuclei

S =-1 Nuclei[Z]

S =0 Nuclei

A[Z+1]A[Z+2]

Kaonic Nuclei

K pp Searches at J-PARC
3--0-

E15 : He(K ,n/p)”K pp”, “K pp”→Λp, Σ p at 1 GeV/c----

K “n”→n+”K “, ”K “+”pp”→K pp
Exclusive measurement0-

K pp→Λp, Σ pIsospin dependence++E27 : d(π ,K ) with proton(s) coin. at 1.69 GeV/c++-Λ(1405) as a doorway; π ”n”→K Λ*(1405), Λ*p→K pp
Semi-exclusive-K pp→p+Y, p+p+π+(γ, π)

E05 :
Spectroscopy of S=-2 systems

S=-2 World

Spectroscopic Study of Ξ-Hypernucleus,
1212+
Be, via the C(K ,K ) Reaction

ΞDiscovery of Ξ-hypernuclei as a peak

J-PARC E05
T. Nagae et al.

Measurement of Ξ-nucleus potential depth and width of12 Be
Ξ

S=-1

S=-2 (Multi-Strangeness System)

S-2S(K-,K+) Spectroscopy ＠J-PARC
K-+p→K++Ξ- ＠~1.8 GeV/c

S-2S Spectrometer

S-2S: (2010-2015)
Acceptance~60 msr∆p/p<5x10-4(FWHM)∆E=1.5 MeV

Tracking
Detector 1,2Q1: vertical focus
Q2: horizontal focus
D1: 70 deg. bend
Tracking
Detector 3,4Acceptance Energy Resolution∆Ω (msr)∆E (MeV)BNL

19TOF

14SKS+

25

3S-2S

60

1.5

Aerogel Cherenkov

Water Cherenkov
1m

S-2S Construction
86 t, 1.5T

∆p/p=5x10-4

12 t, 5.0 T/m
37 t, 8.7 T/m

60msr

1.2 ~ 1.4 GeV/c~9m

D1:Q2Q1

Coupling between Ξ hypernuclei
and double-Λ hypernuclei
Theoretical Calculation for 16ΛΛC,via Ξ- doorways
in the 16O(K-,K+) reaction at 1.8 GeV/c

T.Harada, Y.Hirabayashi, A.Umeya,
PLB 690 (2010) 363.
16O(K-,K+)

7 ~12
nb/sr
T. Harada
et al. / Physics Letters

two-step processcl(αanm!

one-step process

3. Partial-wave states
decomposition
the calculated inclusive
spectrum by the oneofof double-Λ
hyp.
pFig. excitedstep mechanism near theC + Λ + Λ threshold in theO( K − , K + ) reaction
1.8 GeV/c (0◦ ). Vto−14 MeV andv Ξ ,ΛΛ = 500 strength.
MeV were used. The lacouplingpat sensitiveΞ =ΞΝ-ΛΛ14160Nbels 0+ (s2Λ ), 1− (sΛ p Λ ) and 2+ ( p 2Λ ) denote the J π ΛΛ nuclear states of (0sΛ )2 ,(0s )(0p ) and (0p )2 coupled with 14 C(0+ ), respectively. The labels 2+ (s2 ),winrepenotibethonmatthΞ

peSummary
π era

→

E19, E10, E27
PRL, PRC, PLB, PTEP(2)K era
E15, E13, E07, E05, …