Light scalar meson and decay constant in SU(3) gauge theory with eight dynamical flavors Journal Article

Overview

The SU(3) gauge theory with Nf=8 nearly massless Dirac fermions has long been of theoretical and phenomenological interest due to the near-conformality arising from its proximity to the conformal window. One particularly interesting feature is the emergence of a relatively light, stable flavor-singlet scalar meson σ(JPC=0++) in contrast to the Nf=2 theory QCD. In this work, we study the finite-volume dependence of the σ meson correlation function computed in lattice gauge theory and determine the σ meson mass and decay constant extrapolated to the infinite-volume limit. We also determine the infinite-volume mass and decay constant of the flavor-nonsinglet scalar meson a0.; ; ; ; ; Published by the American Physical Society; 2024; ; ;

Brower RC; Owen E; Rebbi C; Culver C; Schaich D; Cushman KK; Fleming GT; Gasbarro A; Hasenfratz A; Neil ET