Search results for "OZI rule"

showing 2 items of 12 documents

Gluonic effects in vector meson photoproduction at large momentum transfers

2001

Non-perturbative QCD mechanisms are of fundamental importance in strong interaction physics. In particular, the flavor singlet axial anomaly leads to a gluonic pole mechanism which has been shown to explain the $\eta^{\prime}$ mass, violations of the OZI rule and more recently the proton spin. We show here that the interaction derived from the gluonic pole exchange explains the high momentum transfer behavior of the photoproduction cross sections of vector mesons at JLab energies.

PhysicsQuantum chromodynamicsNuclear and High Energy PhysicsParticle physicsMesonHigh Energy Physics::LatticeStrong interactionNuclear TheoryHigh Energy Physics::PhenomenologyFísicaFOS: Physical sciencesMomentumHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)OZI ruleProton spin crisisHigh Energy Physics::ExperimentVector mesonAnomaly (physics)Nuclear Experiment
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The phi NN coupling from chiral loops

2002

Starting from effective Lagrangians which combine a gauge formulation of Vector Meson Dominance with Chiral Lagrangians, the coupling of the phi to the nucleon, which is zero at tree level due to the OZI rule, is calculated perturbatively considering loop contributions to the electric and magnetic form factors. We obtain reasonably smaller values for both form factors than those for rho NN and consistent with the expected order of magnitude of the OZI rule violation.

QuarkPhysicsCouplingNuclear and High Energy PhysicsParticle physicsNuclear TheoryNuclear TheoryHigh Energy Physics::PhenomenologyFísicaFOS: Physical sciencesVector meson dominanceGauge (firearms)Nuclear Theory (nucl-th)OZI ruleHigh Energy Physics::ExperimentNucleonOrder of magnitudeMixing (physics)
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