Determining the strange quark mass for 2-flavour QCD

TL;DR

This paper estimates the strange quark mass in unquenched two-flavor QCD using improved lattice actions and non-perturbative renormalization, providing results in the 100-130 MeV range at 2 GeV.

Contribution

It presents a non-perturbative lattice QCD determination of the strange quark mass with continuum extrapolation, improving accuracy over previous methods.

Findings

Strange quark mass estimated between 100-130 MeV at 2 GeV.

Results are consistent with other recent lattice determinations.

Continuum limit achieved through multiple lattice spacings.

Abstract

Using the O(a) Symanzik improved action an estimate is given for the strange quark mass for unquenched (n_f=2) QCD. The determination is via the axial Ward identity (AWI) and includes a non-perturbative evaluation of the renormalisation constant. Numerical results have been obtained at several lattice spacings, enabling the continuum limit to be taken. Our results indicate a value for the strange quark mass (in the MS-bar scheme at a scale of 2 GeV) in the range 100 - 130 MeV. A comparison is also made with other recent lattice determinations of the strange quark mass using dynamical sea quarks.