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Strange Quark Magnetic Moment of the Nucleon at Physical Point

Authors :
Jian Liang
Yi-Bo Yang
Terrence Draper
Keh-Fei Liu
Raza Sabbir Sufian
Andrei Alexandru
Publication Year :
2016
Publisher :
arXiv, 2016.

Abstract

We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of $0.051 \,\text{GeV}^2 \lesssim Q^2 \lesssim 1.31 \,\text{GeV}^2 $. The finite lattice spacing and finite volume corrections are included in a global fit with $24$ valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment $G^s_M(0) = - 0.064(14)(09)\, \mu_N$. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius $\langle r_s^2\rangle_E = -0.0043 (16)(14)\,$ $\text{fm}^2$.<br />Comment: Published version in Physical Review Letters

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....a6d16ffd297e39cd8b5a72ede9c75a98
Full Text :
https://doi.org/10.48550/arxiv.1606.07075