Octet baryon magnetic moments from QCD sum rules

TL;DR

This paper uses QCD sum rules with external fields and generalized interpolating fields to calculate octet baryon magnetic moments, analyzing various tensor structures and comparing results with experimental data.

Contribution

It introduces a comprehensive set of QCD sum rules for octet baryon magnetic moments, including new analysis methods and detailed quark contribution isolation.

Findings

Validated sum rules with good OPE convergence and ground-state dominance

Predicted magnetic moments consistent with experimental values

Isolated individual quark contributions to baryon magnetic moments

Abstract

A comprehensive study is made for the magnetic moments of octet baryons in the method of QCD sum rules. A complete set of QCD sum rules is derived using the external field method and generalized interpolating fields. For each member, three sum rules are constructed from three independent tensor structures. They are analyzed in conjunction with the corresponding mass sum rules. The performance of each of the sum rules is examined using the criteria of OPE convergence and ground-state dominance, along with the role of the transitions in intermediate states. Individual contributions from the u, d and s quarks are isolated and their implications in the underlying dynamics are explored. Valid sum rules are identified and their predictions are obtained. The results are compared with experiment and previous calculations.