arXiv:1602.00796·v1·High Energy Physics — Lattice
S-parameter and vector decay constant in QCD with eight fundamental fermions
LatKMI collaboration: Yasumichi Aoki (1)🇯🇵 · Tatsumi Aoyama (1)🇯🇵 · Ed Bennett (2,1)🇯🇵 · Masafumi Kurachi (3)🇯🇵 · Toshihide Maskawa (1)🇯🇵 · Kohtaroh Miura (4,1)🇯🇵 · Kei-ichi Nagai (1)🇯🇵 · Hiroshi Ohki (5)🇺🇸 · Enrico Rinaldi (6)🇺🇸 · Akihiro Shibata (3)🇯🇵 · Koichi Yamawaki (1)🇯🇵 · Takeshi Yamazaki (7) ((1) KMI, (2) Swansea, (3) KEK, (4) CPT Marseille, (5) RIKEN-BNL, (6) LLNL, (7) Tsukuba)🇯🇵
Abstract
SU(3) gauge theory with eight massless fundamental fermions seems to be near the conformal boundary, and is a candidate theory of walking technicolor. Along the series of study by LatKMI collaboration using HISQ fermions, S-parameter and vector decay constant, which provide important constraints in the model of electroweak symmetry breaking, are calculated for this theory. Use of various volumes allows a systematic investigation of finite volume effects. A strong sensitivity of the S-parameter to the volume is found.
Comments: 7 pages, 7 figures, Proceedings of the 33rd International Symposium on Lattice Field Theory, July 14-18, 2015, Kobe, Japan