Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

Abstract

We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of the chiral condensate relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.

References in corpus (10)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Continuum Limit Physics from 2+1 Flavor Domain Wall QCD
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• The physics of eight flavours
• Nearly conformal gauge theories in finite volume
• Scaling relations for the entire spectrum in mass-deformed conformal gauge theories
• Parity Doubling and the S Parameter Below the Conformal Window
• S-parameter and pseudo-Nambu-Goldstone boson mass from lattice QCD
• Lattice Monte-Carlo study of pre-conformal dynamics in strongly flavoured QCD in the light of the chiral phase transition at finite temperature

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