Isospin Symmetry Breaking in the Chiral Quark Model

Details Isospin Symmetry Breaking in the Chiral Quark Model Isospin Symmetry Breaking in the Chiral Quark Model

2010-12-10

arxiv.org/abs/1012.2163v1

Phys.Rev.D82:113011,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 latex pages, 3 figures, final version for journal publication

Scientific paper

10.1103/PhysRevD.82.113011

We discuss the isospin symmetry breaking (ISB) of the valence- and sea-quark distributions between the proton and the neutron in the framework of the chiral quark model. We assume that isospin symmetry breaking is the result of mass differences between isospin multiplets and then analyze the effects of isospin symmetry breaking on the Gottfried sum rule and the NuTeV anomaly. We show that, although both flavor asymmetry in the nucleon sea and the ISB between the proton and the neutron can lead to the violation of the Gottfried sum rule, the main contribution is from the flavor asymmetry in the framework of the chiral quark model. We also find that the correction to the NuTeV anomaly is in an opposite direction, so the NuTeV anomaly cannot be removed by isospin symmetry breaking in the chiral quark model. It is remarkable that our results of ISB for both valence- and sea-quark distributions are consistent with the Martin-Roberts-Stirling-Thorne parametrization of quark distributions.

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