An estimate of the chiral condensate from unquenched lattice QCD

TL;DR

This paper estimates the chiral condensate value using unquenched lattice QCD data and compares it with other determinations, providing a key parameter for understanding chiral symmetry breaking.

Contribution

It introduces a new estimate of the chiral condensate based on parameters from unquenched lattice QCD calculations with 2+1 sea quark flavors.

Findings

Estimated <psi_bar psi> = -(259 ± 27 MeV)^3 in MS_bar scheme.

Provides a comparison with other existing determinations.

Supports the consistency of lattice QCD results with theoretical expectations.

Abstract

Using the parameters in the chiral Lagrangian obtained by MILC from their unquenched lattice QCD calculations with 2+1 flavours of sea quarks, I estimate <psi_bar psi> (2 GeV)/n_f = -(259 \pm 27 MeV)**3 in the MS_bar scheme. I compare this value to other determinations.