Strange Magnetic Moment and Isospin Symmetry Breaking

Abstract

The small mass difference $m_n-m_p=1.3MeV$ between the proton and neutron leads to an excess of $n={\pi }^{-}p$ over $p={\pi }^{+}n$ fluctuations which can be calculated by using a light-cone meson-baryon fluctuation model of intrinsic quark-antiquark pairs of the nucleon sea. The Gottfried sum rule violation may partially be explained by isospin symmetry breaking between the proton and neutron and the same effect introduces correction terms to the anomalous magnetic moments and the anomalous weak magnetic moments of the proton and neutron. We also evaluated the strange magnetic moment of the nucleon from the lowest strangeness $K\Lambda$ fluctuation and found a non-trivial influence due to isospin symmetry breaking in the experimental measurements of the strange magnetic moment of the nucleon.

14 latex pages, to be published in Physics Letters B

References in corpus (2)

• Measurement of the Proton's Neutral Weak Magnetic Form Factor
• Nucleon spin-flavor structure in SU(3) breaking chiral quark model

Cited by in corpus (19)

• Parity-violating electroweak asymmetry in $\vec{e}p$ scattering
• New Measurement of Parity Violation in Elastic Electron-Proton Scattering and Implications for Strange Form Factors
• Strangeness in the nucleon: neutrino-nucleon and polarized electron-nucleon scattering
• The nucleon's strange electromagnetic and scalar matrix elements
• Isospin violation in the vector form factors of the nucleon
• Nucleon Charge Symmetry Breaking and Parity Violating Electron-Proton Scattering
• Strange form factors in the context of SAMPLE, HAPPEX, and A4 experiments
• Baryon vector and axial content up to the 7Q component
• On the two-boson exchange corrections to parity-violating elastic electron-proton scattering
• Charge symmetry violation in the parton distributions of the nucleon
• Isospin violation and the proton's neutral weak magnetic form factor
• Isospin breaking in the vector current of the nucleon
• Nucleon strange $s\bar{s}$ asymmetry to the $\Lambda /\bar{\Lambda }$ fragmentation
• Strange quark-antiquark asymmetry of nucleon sea from $\Lambda /\bar{\Lambda }$ polarization
• Nucleon strangeness polarization from $\Lambda /\bar{\Lambda }$ hyperon production in polarized proton-proton collision at RHIC
• Effect due to charge symmetry violation on the Paschos-Wolfenstein relation
• Quark-antiquark asymmetry of helicity distributions in the nucleon sea
• Charge-symmetry-breaking nucleon form factors
• Strange Vector Form Factor of Kaons