Double handbag description of proton-antiproton annihilation into a heavy meson pair

TL;DR

This paper introduces a perturbative QCD framework using a double handbag approach to describe proton-antiproton annihilation into heavy meson pairs, specifically focusing on the $p ar{p} o ar{D^0} D^0$ process.

Contribution

It proposes a novel factorization method based on transition distribution amplitudes and applies it within a scalar diquark model to predict cross sections for upcoming experiments.

Findings

Calculated expected cross sections for PANDA experiment.

Demonstrated factorization using charm-quark mass as a large scale.

Provided a new theoretical approach for heavy meson production in proton-antiproton annihilation.

Abstract

We propose to describe the process $ p \bar{p} \,\to\, \bar{D^0} D^0$ in a perturbative QCD motivated framework where a double-handbag hard process $ u d \bar u \bar d \to \bar{c} c$ factorizes from transition distribution amplitudes, which are quasi forward hadronic matrix elements of $\Psi_q \Psi_q \Psi_c $ operators, where q denotes light quarks and c denotes the heavy quark. We advocate that the charm-quark mass acts as the large scale allowing this factorization. We calculate this process in the simplified framework of the scalar diquark model and present the expected cross sections for the PANDA experiment at GSI-FAIR.