Finite volume corrections to the electromagnetic current of the nucleon

TL;DR

This paper calculates finite volume corrections to the nucleon's electromagnetic properties using chiral perturbation theory and applies these corrections to lattice QCD data.

Contribution

It provides the first systematic computation of finite volume effects on nucleon electromagnetic currents at this order in chiral perturbation theory.

Findings

Finite volume corrections significantly affect lattice QCD results.

Corrections improve agreement between lattice data and experimental values.

Method can be extended to other nucleon observables.

Abstract

We compute corrections to both the isovector anomalous magnetic moment and the isovector electromagnetic current of the nucleon to $O(p^3)$ in the framework of covariant two-flavor Baryon Chiral Perturbation Theory. We then apply these corrections to lattice data for the anomalous magnetic moment from the LHPC, RBC & UKQCD and QCDSF collaborations.