Analysis of the $γn \to K^+ Σ^-(1385)$ photoproduction

Abstract

In our previous work [Phys. Rev. D 101, 074025 (2020)], the photoproduction γp → K + Σ 0 (1385) has been investigated within an effective Lagrangian approach. There, the reaction amplitudes were constructed by considering the t-channel K and K * (892) exchanges, s-channel N contribution, u-channel Λ exchange, generalized contact term, and a minimum number of s-channel N and ∆ resonance diagrams. It was found that the inclusion of one of the N (1895)1/2 − , ∆(1900)1/2 − , and ∆(1930)5/2 − resonances is essential to reproduce the available differential and total crosssection data for γp → K + Σ 0 (1385). In the present work, we employ the same model to study the photoproduction γn → K + Σ − (1385), with the purpose being to understand the reaction mechanism and, in particular, to figure out which one of the N (1895)1/2 − , ∆(1900)1/2 − , and ∆(1930)5/2 − resonances is really capable for a simultaneous description of the data for both K + Σ 0 (1385) and K + Σ − (1385) photoproduction reactions. The results show that the available data on differential and total cross sections and photo-beam asymmetries for γn → K + Σ − (1385) can be reproduced only with the inclusion of the ∆(1930)5/2 − resonance rather than the other two. The generalized contact term and the t-channel K exchange are found to dominate the background contributions. The resonance ∆(1930)5/2 − provides the most important contributions in the whole energy region considered, and it is responsible for the bump structure exhibited in the total cross sections.

Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory

“…In another aspect, photoproduction of meson is also an excellent tool to extract information about the mechanism of the strong interaction at low energies [7,9,[29][30][31][32][33][34][35][36][37][38]. It is helpful to determine the basic properties of nucleon resonances, such as the spin, pole positions, beam asymmetries, anomalous magnetic moments, and electromagnetic couplings [10,[39][40][41][42][43][44][45][46].…”