QCD description of charmonium plus light meson production in antiproton-nucleon annihilation

TL;DR

This paper models the production of J/ψ and π-mesons in antiproton-nucleon annihilation using QCD collinear factorization, predicting measurable cross sections for upcoming experiments.

Contribution

It introduces a QCD-based framework for describing charmonium plus light meson production in antiproton-nucleon annihilation, emphasizing the factorization approach.

Findings

Predicts dominant reaction mechanisms in forward and backward regions.

Provides estimates of cross sections relevant for PANDA experiment.

Highlights the role of soft hadronic matrix elements in the process.

Abstract

The associated production of a $J/{\psi}$ and a $\pi$-meson in antiproton-nucleon annihilation is studied in the framework of QCD collinear factorization. In this approach, a hard subprocess responsible for the production of the heavy quark-antiquark pair factorizes from soft hadronic matrix elements, such as the antiproton (nucleon) distribution amplitude and the nucleon-to-pion (antiproton-to-pion) transition distribution amplitude. This reaction mechanism should dominate the forward and backward kinematical regions, where the cross sections are expected to be measurable in the set-up of the PANDA experiment at the GSI-Fair facility.