Analysis of the differential cross section and photon beam asymmetry data for $\gamma p \to \eta^\prime p$

TL;DR

This study investigates the reaction mechanisms of gamma p to eta prime p using an effective Lagrangian approach, successfully describing experimental data and identifying key nucleon resonances involved.

Contribution

It introduces a comprehensive model including specific nucleon resonances to accurately describe eta prime photoproduction data.

Findings

Successful description of differential cross sections and beam asymmetries

Identification of N(1875)3/2^- and N(2040)3/2^+ as key resonances

Predictions for target nucleon asymmetries

Abstract

The photoproduction reaction of $\gamma p \to \eta^\prime p$ is investigated based on an effective Lagrangian approach in the tree-level approximation, with the purpose being to understand the reaction mechanisms and to extract the resonance contents and the associated resonance parameters in this reaction. Apart from the $t$-channel $\rho$ and $\omega$ exchanges, $s$- and $u$-channel nucleon exchanges, and generalized contact term, the exchanges of a minimum number of nucleon resonances in the $s$ channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that a satisfactory description of the available data on both differential cross sections and photon beam asymmetries can be obtained by including in the $s$ channel the exchanges of the $N(1875)3/2^-$ and $N(2040)3/2^+$ resonances. The reaction mechanisms of $\gamma p \to \eta^\prime p$ are discussed and a prediction for the target nucleon asymmetries is presented.