Photoproduction of γp→f0(980)p in an effective Lagrangian approach

Abstract

The most recent data on differential cross sections and photon beam asymmetries Σ from the LEPS2/BGOegg Collaboration for the γp→f0(980)p reaction are analyzed within a tree-level effective Lagrangian approach. The t-channel ρ and ω exchanges, the u- and s-channel N exchanges, the interaction current, and the possible s-channel N* exchanges are taken into account in constructing the reaction amplitudes to reproduce the data. The results show that the contributions from either the N(2040)3/2+ or the N(2100)1/2+ resonance exchange in the s channel are necessarily required to describe the LEPS2/BGOegg data and they dominate the differential cross sections of γp→f0(980)p. Further analysis shows that the contributions from the t-channel ρ and ω exchanges and the interaction current are rather small to both differential cross sections and photo beam asymmetries, and the contributions from u-channel N exchange are considerable in the case of including N(2040)3/2+ in the model while negligible in the case of including N(2100)1/2+ in the model. Predictions of target asymmetries T for γp→f0(980)p are given, which can be examined by future experiments. Published by the American Physical Society 2024