The axial charge of the nucleon on the lattice and in chiral perturbation theory

TL;DR

This paper reports lattice QCD calculations of the nucleon's axial charge using dynamical quarks, comparing results with chiral perturbation theory to validate theoretical models and understand finite-volume effects.

Contribution

It provides new lattice QCD data for the nucleon axial charge and demonstrates consistency with chiral perturbation theory predictions.

Findings

Lattice data aligns well with chiral perturbation theory.

Finite-volume effects are well described by the theory.

Results support the validity of chiral effective theories for nucleon properties.

Abstract

We present recent Monte Carlo data for the axial charge of the nucleon obtained by the QCDSF-UKQCD collaboration for N_f=2 dynamical quarks. We compare them with formulae from chiral perturbation theory in finite and infinite volume and find a remarkably consistent picture.