Theory Seminar

KEK 素粒子原子核研究所 理論セミナー

TITLE The lattice study of many flavor QCD with twisted boundary condition
(in English)
SPEAKER Dr. Kenji Ogawa
(National Chiao-Tung University, Taiwan/
KEK-NCTS exchange program visitor)
DATE: September 27 (Tue.) 11:00 − 12:00
PLACE: Kenkyu Honkan 1F, Meeting Room 1


Incorporated with twisted boundary condition, Polyakov loop correlators can give a definition of renormalized coupling. We employ this scheme for step scaling function in the search of conformal fixed point. Staggered fermion and plaquette gauge action are used in the lattice simulation with six different lattice sizes L = 20, 16, 12, 10, 8 and 6. For the largest lattice size L = 20, we used a large number of GPU's and accumulated 3,000,000 trajectories in total. We found that the step scaling function sigma(u) is consistent with u in the low beta region. It strongly suggests the existence of conformal fixed point. Some details of our analysis and simulations will also be presented.