Light hadron spectrum and quark masses in 2+1 flavor QCD

TL;DR

This study performs 2+1 flavor full QCD simulations to accurately determine the light meson spectrum and quark masses, achieving results consistent with experimental data and providing insights into continuum limit extrapolations.

Contribution

First comprehensive analysis of light hadron spectrum and quark masses in 2+1 flavor QCD using multiple lattice spacings with non-perturbative improvement.

Findings

Reproduced experimental meson masses

Determined light quark masses with high precision

Provided preliminary results at finest lattice spacing

Abstract

CP-PACS and JLQCD collaborations are carrying out a joint project of the 2+1 flavor full QCD simulation. Gauge configurations are generated for the non-perturbatively $O(a)$-improved Wilson quark action and the Iwasaki gauge action using PHMC algorithm at three lattice spacings, $a\sim 0.076$, 0.010 and 0.122 fm, with a fixed physical volume $(2.0 fm)^3$. We present analysis for the light meson spectrum and quark masses in the continuum limit, which are determined using data obtained from the simulations at the two coarser lattices. Our simulations reproduce experimental values of meson masses. The ud and strange quark masses turn out to be $m_{ud}^{\bar{MS}}(\mu=2 GeV)=3.34(23) MeV$ and $m_s^{\bar{MS}}(\mu=2 GeV)=86.7(5.9) MeV$. We also show preliminary results at our finest lattice spacing for which simulations are still being continued.