Backward charmonium production in $\pi N$ collisions
B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski
TL;DR
This paper explores the theoretical description of backward $J/\psi$ meson production in pion-nucleon collisions using QCD factorization, providing calculations and cross section estimates relevant for J-Parc experiments.
Contribution
It introduces a leading-order QCD calculation of backward charmonium production via transition distribution amplitudes in pion-nucleon collisions.
Findings
Calculated scattering amplitude at leading order
Estimated cross sections for backward $J/\psi$ production
Applicable to medium energy pion beams at J-Parc
Abstract
The QCD collinear factorization framework allows to describe exclusive backward production of a meson in pion-nucleon collisions in terms of pion-to-nucleon transition distribution amplitudes. We calculate the scattering amplitude at the leading order in the strong coupling constant and estimate the cross section of this reaction in the backward kinematical region for a medium energy pion beam available at the J-Parc experimental facility.
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