Charge Symmetry Breaking in Spin Dependent Parton Distributions and the Bjorken Sum Rule

TL;DR

This paper presents the first lattice QCD determination of charge symmetry violation in spin-dependent parton distributions and discusses its impact on the Bjorken sum rule, providing new insights into nucleon structure.

Contribution

First lattice QCD calculation of charge symmetry violation in spin-dependent parton distributions and analysis of its effect on the Bjorken sum rule.

Findings

Charge symmetry violation in spin-dependent distributions quantified.

Comparison with quark model predictions performed.

CSV contributions to the Bjorken sum rule identified as the only partonic corrections.

Abstract

We present the first determination of charge symmetry violation (CSV) in the spin-dependent parton distribution functions of the nucleon. This is done by determining the first two Mellin moments of the spin-dependent parton distribution functions of the octet baryons from N_f = 2 + 1 lattice simulations. The results are compared with predictions from quark models of nucleon structure. We discuss the contribution of partonic spin CSV to the Bjorken sum rule, which is important because the CSV contributions represent the only partonic corrections to the Bjorken sum rule.