Gasser-Leutwyler coefficients: A progress report

TL;DR

This paper reports progress in determining Gasser-Leutwyler coefficients using lattice QCD, focusing on systematic error estimation and incorporating recent algorithmic improvements for staggered quarks.

Contribution

It provides an update on the determination of Gasser-Leutwyler coefficients, including systematic error analysis and plans to integrate new algorithmic techniques.

Findings

Progress in estimating two Gasser-Leutwyler coefficients

Comprehensive systematic error analysis conducted

Plans to incorporate algorithmic improvements into ongoing research

Abstract

Last year, we reported our first results on the determination of Gasser-Leutwyler coefficients using partially quenched lattice QCD with three flavors of dynamical staggered quarks. We give an update on our progress in determining two of these coefficients, including an exhaustive effort to estimate all sources of systematic error. At this conference, we have heard about algorithmic techniques to reduce staggered flavor symmetry breaking and a method to incorporate staggered flavor breaking into the partially quenched chiral Lagrangian. We comment on our plans to integrate these developments into our ongoing program.