Isospin-Violating Meson-Nucleon Vertices as an Alternate Mechanism of Charge-Symmetry Breaking

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dc.creatorGardner, S.
dc.creatorHorowitz, C. J.
dc.creatorPiekarewicz, J.
dc.date1995-08-22
dc.date.accessioned2026-07-07T11:36:34Z
dc.date.available2026-07-07T11:36:34Z
dc.descriptionWe compute isospin-violating meson-nucleon coupling constants and their consequent charge-symmetry-breaking nucleon-nucleon potentials. The couplings result from evaluating matrix elements of quark currents between nucleon states in a nonrelativistic constituent quark model; the isospin violations arise from the difference in the up and down constituent quark masses. We find, in particular, that isospin violation in the omega-meson--nucleon vertex dominates the class IV CSB potential obtained from these considerations. We evaluate the resulting spin-singlet--triplet mixing angles, the quantities germane to the difference of neutron and proton analyzing powers measured in elastic $\vec{n}-\vec{p}$ scattering, and find them commensurate to those computed originally using the on-shell value of the $ρ$-$ω$ mixing amplitude. The use of the on-shell $ρ$-$ω$ mixing amplitude at $q^2=0$ has been called into question; rather, the amplitude is zero in a wide class of models. Our model possesses no contribution from $ρ$-$ω$ mixing at $q^2=0$, and we find that omega-meson exchange suffices to explain the measured $n-p$ analyzing power difference~at~183 MeV.
dc.description20 pages, revtex, 3 uuencoded PostScript figures
dc.identifierhttps://arxiv.org/abs/nucl-th/9508035
dc.identifierhttp://arxiv.org/abs/nucl-th/9508035
dc.identifierPhys.Rev.C53:1143-1153,1996
dc.identifierdoi:10.1103/PhysRevC.53.1143
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198959
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleIsospin-Violating Meson-Nucleon Vertices as an Alternate Mechanism of Charge-Symmetry Breaking
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