K*Sigma photoproduction off the proton target with baryon resonances

TL;DR

This study models K*Sigma photoproduction off protons using an effective Lagrangian approach, highlighting dominant contributions from Delta(1232) and strange-meson exchanges, with higher resonances mainly affecting polarization observables.

Contribution

It provides a comprehensive covariant analysis including various baryon resonances and compares results with experimental data, emphasizing the dominant reaction mechanisms.

Findings

Resonance contributions are minor for cross sections.

Delta(1232) and strange-meson exchanges dominate the process.

Higher resonances significantly influence polarization asymmetries.

Abstract

We investigate the photoproduction of K*0Sigma+ and K*+Sigma0 off the proton target, employing the effective Lagrangian approach at the tree-level Born approximation. In addition to the (s, t, u)-channel Born diagrams, we take into account various baryon-resonance contributions such as F15(2000), D13(2080), G17(2190), D15(2200), F35(2000), G37(2200), F37(2390), and Sigma*(1385, 3/2+) in a fully covariant manner. We present the numerical results for the energy and angular dependences for the cross sections in comparison to available experimental data. The single-polarization observables, i.e. the photon-beam, recoil and target baryon polarization asymmetries are computed as well for future experiments. We observe from the numerical results that the resonance contributions play a minor role in producing the strength of the cross sections, being different from the K*Lambda photoproduction. In contrast, it turns out that the Delta(1232)-pole contribution and strange-meson exchanges in the t-channel dominate the scattering process. On the other hand, the higher resonances influence the polarization observables such as the recoil and target asymmetries.