Sigma photoproduction in the resonance region

Details Sigma photoproduction in the resonance region Sigma photoproduction in the resonance region

2002-02-22

arxiv.org/abs/nucl-th/0202074v2

Phys.Rev. C66 (2002) 035202

Physics

Nuclear Physics

Nuclear Theory

subsection and table added, to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.66.035202

A study of p(gamma,K)Sigma processes in an isobar model at tree level is reported. By comparing model calculations to the published SAPHIR data, we explore the possible role of different isospin I=1/2 (N*) and I=3/2 (Delta*) resonances in the reaction dynamics. In our analysis, the inclusion of the ``missing'' D_{13}(1895) resonance does only slightly improve the global description of the Sigma photoproduction data. More convincing signals for the presence of such a ``missing'' resonance emerged in the analysis of the isospin related p(gamma,K+)Lambda reaction. Various implementations of the nonresonant part of the Sigma photoproduction amplitude are presented. The sensitivity of the computed observables and extracted resonance parameters to the uncertainties inherent to the treatment of the nonresonant (background) diagrams are discussed.

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