Chiral and Continuum Extrapolation of Partially-Quenched Lattice Results

TL;DR

This paper presents a comprehensive analysis of lattice QCD results for the vector meson mass, incorporating discretisation, finite-volume, and partial quenching effects within a framework consistent with low-energy QCD, including a model for rho decay.

Contribution

It introduces a unified approach to handle various artefacts in lattice QCD simulations and models the rho-meson decay channel for accurate extrapolation to physical quark masses.

Findings

Successful extraction of vector meson mass from lattice data

Effective treatment of artefacts within a low-energy QCD framework

Modeling of rho decay channel for physical extrapolation

Abstract

The vector meson mass is extracted from a large sample of partially quenched, two-flavor lattice QCD simulations. For the first time, discretisation, finite-volume and partial quenching artefacts are treated in a unified framework which is consistent with the low-energy behaviour of QCD. This analysis incorporates the leading infrared behaviour dictated by chiral effective field theory. As the two-pion decay channel cannot be described by a low-energy expansion alone, a highly-constrained model for the decay channel of the rho-meson is introduced. The latter is essential for extrapolating lattice results from the quark-mass regime where the rho is observed to be a physical bound state.