Report from A01 group	
Tetsuya Onogi (Osaka Univ.)	

11.12.4

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(Co-) representative

T. Onogi (Osaka) , Y. Kuramashi (Tsukuba), Y. Yamada (KEK)

Main-collaborators

Osaka: H. Fukaya
KEK: T. Kaneko, J. Noaki, S. Hashimoto,
Tsukuba: N . Ishizuka, Y. Taniguchi, N. Ishii
Nagoya: Y. Aoki, M. Hayakawa, T.Yamazaki
Teikyo: Y. Furui
Hiroshima: K.I. Ishikawa

Sub-collaborators

T. Izubuchi, E. Shintani (Riken/BNL)PD
Sang-Woo Kim (Osaka), Jong-Wan Lee
Namekawa (Tsukuba)
11.12.42

Goal of A01 group
3. Particle Physics Phenomenology

QCDquark dynamics•••

Determination of QCD parameters
Flavor Physics
Beyond Standard Model

1. Vacuum and hadronic properties••

Hadron spectrum and form facorts
Chiral dynamics

2. Hadron interactions•••

11.12.4

Nuclear potential
Nuclei
Exotic states3Activities in 2011	
5 Journal papers
1.

H.Fukaya et al. [JLQCD and TWQCD Collaboration], ``Determination of thechiral condensate from QCD Dirac spectrum on the lattice,'' Phys. Rev. D 83
(2011) 074501

2.

K.Takeda et al. [JLQCD Collaboration], ``Nucleon strange quark content
from two-flavor lattice QCD with exact chiral symmetry,'' Phys Rev. D 83(2011) 114506

3.

M.Hayakawa, K.-I.Ishikawa, Y.Osaki, S.Takeda, S.Uno and N.Yamada,``Running coupling constant of ten-flavor QCD with the Schrodinger
functional method,'' Phys. Rev. D 83 (2011) 074509

4.

T.Yamazaki, Y.Kuramashi and AUkawa, ``Two-Nucleon Bound States in
Quenched Lattice QCD,‘’ Phys. Rev. D 84 (2011) 054506  Talk by Yamazaki

5.

Y.Namekawa et al. [PACS-CS Collaboration], ``Charm quark system at thephysical point of 2+1 flavor lattice QCD,'' Phys. Rev. D 84 (2011) 074505
 Talk by Namekawa
11.12.4

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Activities in 2011	
2 preprints
1.

T.Aoyama, H.Ikeda, E.Itou, M.Kurachi, C.-J.D.Lin, H.Matsufuru, K.Ogawa,
H.Ohki, T. Onogi, E. Shintani, T. Yamazaki , ``Conformal fixed point of SU(3) gauge theory with 12 fundamental fermions,'' arXiv:1109.5806 [hep-lat].

2.

S.Aoki et al. [PACS-CS Collaboration], ``rho Meson Decay in 2+1 Flavor
Lattice QCD,'' arXiv:1106.5365 [hep-lat].

11.12.4

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Activities in 2011	
4 proceedings
1.

S-W. Kim et al. [The JLQCD Collaboration], ``Lattice study of 4d {\cal N}=1
super Yang-Mills theory with dynamical overlap gluino,'' arXiv:1111.2180[hep-lat].

2.

K.Ogawa, T.Aoyama, H.Ikeda, E.Itou, M.Kurachi, C.J.D.Lin, H.Matsufuru,H.Ohki, T. Onogi, E. Shintani, T. Yamazaki , ``The Infrared behavior of SU(3)Nf=12 gauge theory -about the existence of conformal fixed point-,'' arXiv:1111.1575 [hep-lat].

3.

H. Fukaya et al. [JLQCD Collaboration], ``Chiral interpolation in a finite
volume,‘’ arXiv:1111.0417 [hep-lat].  Talk by Fukaya

4.

T.Yamazaki, Y.Kuramashi and A.Ukawa, ``Calculation of Helium nuclei inquenched lattice QCD,‘’ AIP Conf. Proc. 1374 (2011) 627. Talk by Yamazaki

11.12.4

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Renewals of the supercomputer	
••
•
•
•

KEK supercomputer (SR11000, BlueGene) was shutdown in Dec. 2010.
YITP supercomputer (SR16000) started in Jan. 2011
The Earthquake, March 2011.
KEK supercomputer (SR16000) started in September 2011.
KEK supercomputer (Blue/Gene) will start in March 2012.	

There has been a time that YITP, T2K are the most powerful machines.
We recognized that having independent machine is important.
We also recognized that DataGrid with fast network and large disk
is also important.

11.12.4

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No group meetings, but closely related one
1. “Future directions of lattice QCD”
July 27, 2011 @ Univ. of Tokyo
organized by••11.12.4

Joint Institute for Computational Fundamental Science
HPCI strategic program, field 58

Appologies	
From now on, I pick up only part of the activities, for which1) possible speaker on the topic is absent,and/or2) the topic was not explained last year.
There are many interesting topics which should be explained.
I feel very sorry for
Cossu-san, Ejiri-san, Iida-san, Ishii-san, Fukaya-san,Kouhei Takeda-san, Kaneko-san, Ishizuka-san. ,Speakers	

11.12.49

2. Hadron Physics	

11.12.4

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QCD with finite density,
S. Takeda, Y. Kuramashi, A. Ukawa , arXiv:1111.6363	
Upper bound for the phase of quark determinant
quark winding number & 1/m expansion	

At lower temperature andheavier quark massand for,Sign problem is less severe.	
Numerical test on
For 4-flavor QCD with Wilson fermion 	11.12.4

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Smaller sign problem	

11.12.4

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Two nucleon bound state,

T. Yamazaki et al, ariXiv:1105.1418	
Quenched lattice QCD study with	

Bound state for deuteron.	
11.12.413

• The reason for larger bound state in triplet channel and theexistence of bound state in singlet channel are unclear.
 Further studies on various systematic error are needed.
• Personally, a study of nuclear potential with exactly the same
parameter (( quenched QCD with a=0.128fm, mpi=0.8 GeV)
seems to be very important.
 It would help to understand the sys. error of YamazakiKuramashi-Ukawa calculation.
 It would also give a good test of the method by HAL collaboration.

11.12.414

3. Particle Physics Phenomenology 	

11.12.4

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Charm quark physics (D meson),Y.Namekawa et al. [PACS-CS Collaboration],
Phys. Rev. D 84 (2011) 074505

2+1 flavor QCD with relativisitc heavy quark action	

“fD puzzle” is solved.
Application to flavor physics is promising.	
11.12.416

Conformal window	
Search for conformal phase in many flavor QCD	
10-flavors	

M.Hayakawa,, S.Takeda, N.Yamada, et al
Phys. Rev. D 83 (2011) 074509

12-flavors	

T.Aoyama, E.Itou, et al. arXiv:1109.5806

RG evolution of the running coupling is studied.
Evidence for IR fixed point  Useful for Walking technicolor theory?	
11.12.4

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Gluino condensate in N=1 SUSY Yang-Mills theory	
First step	

S-W. Kim et al. [The JLQCD Collaboration],
arXiv:1111.2180 [hep-lat].	

Nonperturbative study of SUSY QCD vacuum is needed!
A lot of mysteries: N=1 Seiberg-duality, metastable vacua, …
SUSY breaking mechanism is also important.
Eigenvalue distribution
for Gluino Dirac operator	

Chiral extrapolation ofGluino condensation.

Gluino condensation from 1st principles of N=1 SUSY YM!	

Expansion of 3-dim space in superstring theory	
S.-W. Kim, J Nishimura, A. Tsuchiya,

Arxiv:1108. 1540, 1110. 4803 	

New simulation method
for IKKT matrix model
In Lorentzian signature	Tij(t)tof0eigenvalues

0.5-2.5-2-1.5-1-0.5

0.4

0.3

0.2

0.10• After some critical time, SSB occurs and SO(9) breaks
down to SO(3)• Inflation from string theory??

Summary	• Many activities in vacuum structure, hadron physics andparticle physics phenomenology.
• I hope there will be intensive discussion on these topics
during this workshop. For people outside A01 group,
the talk by S. Takeda-san and T. Yamazaki-san may be ofparticular interest.
• New machine is installed at KEK and more is coming.
 Next phase of lattice QCD simulation.
11.12.4

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Backup	

11.12.421

Rho meson decay in 2+1 Flavor QCD	11.12.4

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