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.
@article{arxiv.1602.00796,
title = {S-parameter and vector decay constant in QCD with eight fundamental fermions},
author = {LatKMI collaboration and Yasumichi Aoki and Tatsumi Aoyama and Ed Bennett and Masafumi Kurachi and Toshihide Maskawa and Kohtaroh Miura and Kei-ichi Nagai and Hiroshi Ohki and Enrico Rinaldi and Akihiro Shibata and Koichi Yamawaki and Takeshi Yamazaki},
journal= {arXiv preprint arXiv:1602.00796},
year = {2016}
}
Comments
7 pages, 7 figures, Proceedings of the 33rd International Symposium on Lattice Field Theory, July 14-18, 2015, Kobe, Japan