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Walking signals in Nf=8N_f=8 QCD on the lattice

2014
7 pages
Published in:
  • PoS LATTICE2013 (2014) 071
Contribution to:
  • Published: 2014
DOI:
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20122013201401
Abstract:
We investigate walking signals of N f = 8 QCD through meson spectrum using the HISQ (highly improved staggered quark) action. Our data (the pion decay constant, the p and r meson masses and the chiral condensate) for the N f = 8 QCD are consistent with the spontaneously broken chiral symmetry in the chiral limit extrapolation of the chiral perturbation theory (ChPT). Remarkably enough, while the N f = 8 data near the chiral limit are well described by the ChPT, those for the relatively large fermion bare mass m f away from the chiral limit actually exhibit a finite-size hyperscaling relation, suggesting a large anomalous dimension g m 1. This implies that there exists a remnant of the infrared conformality, and suggests that a typical technicolor, “one-family model”, as modeled by the N f = 8 QCD can be a walking technicolor theory.
  • quantum chromodynamics: lattice
  • numerical calculations
  • technicolor: conformal
  • fermion: staggered
  • flavor: 8
  • flavor: 4
  • pseudoscalar meson: decay constant
  • mass spectrum
  • technirho: mass
  • spontaneous symmetry breaking: chiral