Precise determination of the strangeness magnetic moment of the nucleon

TL;DR

This paper combines charge symmetry, chiral extrapolation, and lattice QCD data to precisely determine the proton's strange magnetic moment, achieving a result much more accurate than previous experimental measurements.

Contribution

It introduces a novel combination of theoretical techniques and lattice QCD data to precisely calculate the strange magnetic moment of the nucleon.

Findings

The strange magnetic moment of the proton is G_M^s = -0.046 +/- 0.019 mu_N.

The result is consistent with experimental data but significantly more precise.

This high precision challenges future experimental measurements.

Abstract

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low mass lattice QCD simulations of the individual quark contributions to the magnetic moments of the nucleon octet, we obtain a precise determination of the strange magnetic moment of the proton. The result, namely G_M^s = -0.046 +/- 0.019 mu_N, is consistent with the latest experimental measurements but an order of magnitude more precise. This poses a tremendous challenge for future experiments.