6533b85afe1ef96bd12b8cf9
RESEARCH PRODUCT
KNScattering and the Nucleon Strangeness Radius
Michael J. Ramsey-musolfMichael J. Ramsey-musolfHans-werner HammerHans-werner Hammersubject
Quantum chromodynamicsPhysicsParticle physicsNuclear TheoryUnitarityScatteringNuclear TheoryHigh Energy Physics::PhenomenologyFOS: Physical sciencesGeneral Physics and AstronomyRadiusStrangenessResonance (particle physics)Nuclear Theory (nucl-th)Nuclear physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Dispersion relationHigh Energy Physics::ExperimentNuclear ExperimentNucleondescription
The leading non-zero electric moment of the nucleon strange-quark vector current is the mean square strangeness radius, $$. We evaluate the lightest OZI-allowed contribution to $$, arising from the kaon cloud, using dispersion relations. Drawing upon unitarity constraints as well as $K^{+}N$ scattering and $e^+e^-\to K\bar{K}$ cross section data, we find the structure of this contribution differs significantly from that suggested by a variety of QCD-inspired model calculations. In particular, we find evidence for a strong $\phi$-meson resonance which may enhance the scale of kaon cloud contribution to an observable level.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-05-23 | Physical Review Letters |