Hard two photon processes \gamma\gamma --> M_2 M_1 in QCD

TL;DR

This paper reviews QCD predictions and handbag model results for large-angle two-photon processes producing meson pairs, comparing theoretical models with Belle experimental data to evaluate their accuracy.

Contribution

It provides a comparative analysis of leading term QCD and handbag model predictions for meson pair production in two-photon processes, highlighting their differences and experimental relevance.

Findings

QCD and handbag models show differing predictions for cross sections.

Experimental data from Belle tests the validity of theoretical models.

Results suggest certain models better match observed cross sections.

Abstract

A short review of leading term QCD predictions vs those of the handbag model for large angle cross sections \gamma\gamma --> P_2 P_1 (P is the pseudoscalar meson \pi^{\pm,o}, K^{\pm,o}, \eta), and for \gamma\gamma --> V_2 V_1 (V is the neutral vector meson \rho^o, \omega, \phi), in comparison with Belle Collaboration measuments