Photoproduction of $a_{2}(1320)$ in a Regge model

TL;DR

This paper investigates the photoproduction of the $a_{2}(1320)$ meson off a proton using an effective Lagrangian and Regge model, highlighting differences in cross section predictions and suggesting experimental tests at high energies.

Contribution

It introduces a comparative analysis of Feynman and Regge models for $a_{2}(1320)$ photoproduction, emphasizing the importance of Reggeized treatment at high energies.

Findings

Different shapes of cross sections in Feynman vs. Regge models

Comparison with existing low-energy experimental data

Predictions for high-energy cross sections testable by COMPASS

Abstract

In this work, the photoproduction of $a_{2}(1320)$ off a proton target is investigated within an effective Lagrangian approach and the Regge model. The theoretical result indicates that the shapes of {the} total and differential cross sections of the $\gamma p\rightarrow a_{2}^{+}n$ reaction within the Feynman (isobar) model are much different from that of the Reggeized treatment. The obtained cross section is compared with the existing experimental results at low energies. The $a_{2}(1320)$ production cross section at high energies can be tested by the COMPASS experiment, which can provide important information for clarifying the role of the Reggeized treatment at that energy range.