Photoproduction of K*Σ in an effective Lagrangian approach

¹ School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 101408, China
² College of Science, China University of Petroleum (East China), Qingdao 266580, China
³ School of Physics, Henan Normal University, Henan 453007, China

^* e-mail: huangfei@ucas.ac.cn

Published online: 25 September 2024

Abstract

All the available data on differential cross sections, total cross sections, spin density matrix elements, and parity spin asymmetry for the γp → K*⁺Σ⁰ and γp → K*⁰Σ⁺ reactions are analyzed within an effective Lagrangian approach. The reaction amplitudes are constructed by considering the s-channel exchanges of N, Δ, and their excited states, the t-channel exchanges of K, K*, and κ, the u-channel exchanges of Λ, Σ, and Σ* , and the interaction current. Two fits with different reaction mechanisms are obtained that describe the data equally well. The s-channel Δ(1905)5=2⁺ resonance exchange is found to provide dominant contributions in both fits. The t-channel κ exchange only contributes significantly to γp → K*⁰Σ⁺ in model II, which challenges the claim made in literature that the available parity spin asymmetry data supports the dominant contribution of κ exchange in γp → K*⁰Σ⁺.