S-parameter and vector decay constant in QCD with eight fundamental fermions

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.

7 pages, 7 figures, Proceedings of the 33rd International Symposium on Lattice Field Theory, July 14-18, 2015, Kobe, Japan

References in corpus (5)

• Light composite scalar in eight-flavor QCD on the lattice
• Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory
• Scaling relations for the entire spectrum in mass-deformed conformal gauge theories
• S-parameter and pseudo-Nambu-Goldstone boson mass from lattice QCD
• Parity Doubling and the S Parameter Below the Conformal Window