2+1 flavor light hadron spectrum and quark masses with the O(a) improved Wilson-clover quark formalism

TL;DR

This study uses improved Wilson quark formalism to accurately simulate 2+1 flavor full QCD, achieving meson mass predictions matching experimental values and determining quark masses with high precision.

Contribution

It provides the first continuum limit analysis of light meson spectrum and quark masses using O(a)-improved Wilson quarks at multiple lattice spacings.

Findings

Meson masses reproduce experimental values within 1% in the continuum limit.

Determined light quark masses with high precision at 2 GeV scale.

Achieved consistent results across three lattice spacings.

Abstract

We present a summary of results of the joint CP-PACS and JLQCD project toward a 2+1 flavor full QCD simulation with the O(a)-improved Wilson quark formalism and the Iwasaki gauge action. Configurations were generated during 2002-2005 at three lattice spacings, a~0.076, 0.100 and 0.122 fm, keeping the physical volume constant at (2.0fm)^3. Up and down quark masses are taken in the range m_{PS}/m_V~0.6-0.78. We have completed the analysis for the light meson spectrum and quark masses in the continuum limit using the full configuration set. The predicted meson masses reproduce experimental values in the continuum limit at a 1% level. The average up and down, and strange quark masses turn out to be m_{ud}^{\bar{MS}}(\mu=2 GeV)=3.50(14)({}^{+26}_{-15}) MeV and m_s^{\bar{MS}}(\mu=2 GeV)=91.8(3.9)({}^{+6.8}_{-4.1}) MeV. We discuss our future strategy toward definitive results on hadron spectroscopy with the Wilson-clover formalism.