Role of nucleon resonance excitation in $ϕ$ meson photoproduction

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dc.creatorZhao, Q.
dc.creatorDidelez, J. -P.
dc.creatorGuidal, M.
dc.creatorSaghai, B.
dc.date1999-09-22
dc.date.accessioned2026-07-07T05:43:18Z
dc.date.available2026-07-07T05:43:18Z
dc.descriptionThe resonance effects are investigated in the $ϕ$ meson photoproduction near threshold through a quark model approach with an effective Lagrangian. The diffractive contribution is consistently estimated by the {\it t}-channel Pomeron exchange. Another non-diffractive process, {\it t}-channel $π^0$ exchange is also included. The numerical result shows that the Pomeron exchange plays dominant role in the $ϕ$ meson photoproduction, while the cross sections of the non-diffractive processes, i.e. {\it s}- and {\it u}-channel excitations, and {\it t}-channel $π^0$ exchange, are quite small. In the polarization observables, we find that large asymmetries are produced in the backward direction by the interferences from the {\it s}- and {\it u}-channel resonances, while in the forward direction, only very small asymmetries are generated. Meanwhile, we find that the effects from the $π^0$ exchange are generally negligible.
dc.descriptionContribution to "2nd International Conference on Perspectives in Hadronic Physics", Trieste, ICTP, 10-14 May 1999, to appear in Few-body System
dc.identifierhttps://arxiv.org/abs/nucl-th/9909059
dc.identifierhttp://arxiv.org/abs/nucl-th/9909059
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/83259
dc.subjectNuclear Theory
dc.titleRole of nucleon resonance excitation in $ϕ$ meson photoproduction
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