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
TL;DR
This study calculates the S-parameter and vector decay constant in SU(3) gauge theory with eight fundamental fermions, exploring finite volume effects to inform models of electroweak symmetry breaking.
Contribution
It provides the first systematic analysis of finite volume effects on the S-parameter and decay constants in this near-conformal theory using HISQ fermions.
Findings
Strong volume sensitivity of the S-parameter observed
Finite volume effects significantly impact the S-parameter measurements
Results inform constraints on walking technicolor models
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.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research