Chiral and Continuum Extrapolation of Partially-Quenched Hadron Masses

TL;DR

This paper develops a chiral extrapolation formula for vector meson masses in partially-quenched QCD using finite-range regularisation, and validates it against lattice data, achieving high accuracy in reproducing experimental values.

Contribution

It introduces a chiral extrapolation method with finite-range regularisation for partially-quenched QCD and applies it to vector meson and nucleon masses, including lattice spacing effects.

Findings

Excellent ~1% agreement with experimental M_rho

Effective extrapolation method validated against lattice data

Extension of method to nucleon mass analysis

Abstract

Using the finite-range regularisation (FRR) of chiral effective field theory, the chiral extrapolation formula for the vector meson mass is derived for the case of partially-quenched QCD. We re-analyse the dynamical fermion QCD data for the vector meson mass from the CP-PACS collaboration. A global fit, including finite lattice spacing effects, of all 16 of their ensembles is performed. We study the FRR method together with a naive polynomial approach and find excellent agreement ~1% with the experimental value of M_rho from the former approach. These results are extended to the case of the nucleon mass.