Single Meson Production in Photon-Photon Collisions and Infrared Renormalons

TL;DR

This paper analyzes higher-twist contributions to single meson production in photon-photon collisions, focusing on infrared renormalons, resummation techniques, and the impact of meson wave functions on cross section calculations.

Contribution

It introduces a detailed analysis of infrared renormalon effects and resummation in higher-twist cross sections, comparing running and frozen coupling approaches.

Findings

Resummed higher-twist cross sections are comparable to frozen coupling results.

The ratio of resummed to leading-twist cross sections is independent of meson transverse momentum.

Results depend significantly on the choice of meson wave functions.

Abstract

In this article, we investigate the contribution of the higher-twist Feynman diagrams to the large-$p_T$ inclusive single meson production cross section in photon-photon collisions and present the general formulas for the higher-twist differential cross sections in case of the running coupling and frozen coupling approaches. The structure of infrared renormalon singularities of the higher-twist subprocess cross section and the resummed expression (the Borel sum) for it are found. We compared the resummed higher-twist cross sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross section. We obtain, that ratio $R=(\Sigma_{M^{+}}^{HT})^{res}$ / $(\Sigma_{M^{+}}^{HT})^{0}$, for all values of the transverse momentum $p_{T}$ of the meson identically equivalent to ratio $r$=($\Delta_{M}^{HT})^{res}$ / $(\Delta_{M}^{HT})^{0}$. It is shown that the resummed result depends on the choice of the meson wave functions used in calculation. Phenomenological effects of the obtained results are discussed.