Charge-Symmetry-Breaking Potentials from Isospin-Violating Meson-Baryon Coupling Constants

Abstract

We consider charge-symmetry violations in the nucleon-nucleon force which result from isospin-violating meson-baryon coupling constants. The vector mesons are assumed to couple to the nucleon's electromagnetic current, which we decompose into isoscalar and isovector quark components. We compute these currents in the context of a constituent quark model. The isospin violations in the meson-baryon couplings arise from the difference in the up and down constituent quark masses. We show that class IV charge-symmetry-breaking potentials arise in the resulting $\omega$ and $\rho$ exchange contributions to the $NN$ force. The magnitude of these contributions is consistent with that phenomenologically required by the measured difference of $n$ and $p$ analyzing powers in elastic $\vec{n}-\vec{p}$ scattering at 183 MeV.

arXiv comment8 pages, revtex

References in corpus (5)

• The Momentum Dependence of the $\rho -\omega$ Mixing Amplitude in a Hadronic Model
• Constraints on the momentum dependence of rho-omega mixing
• The Off Shell $\rho$-$\omega$ Mixing in the QCD Sum Rules
• Charge-Symmetry Breaking, Rho-Omega Mixing and the Quark Propagator
• Charge symmetry breaking via rho-omega mixing from model quark-gluon dynamics

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• $\Delta I=1$ axial-vector mixing and charge symmetry breaking
• Isospin-Violating Meson-Nucleon Vertices as an Alternate Mechanism of Charge-Symmetry Breaking
• Relativistic deformed mean-field calculation of binding energy differences of mirror nuclei
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• Vector Meson Mixing and Charge Symmetry Violation
• Novel effects of electromagnetic interaction on the correlation of nucleons in nuclear matter
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