Revealing transversity GPDs through the photoproduction of a photon and a ρ meson
1 Laboratoire de Physique Théorique, UMR 8627, CNRS, Univ. Paris Sud, Université Paris-Saclay, 91405 Orsay, France
2 Centre de physique théorique, École Polytechnique, CNRS, Université Paris-Saclay, 91128 Palaiseau, France
3 National Centre for Nuclear Research (NCBJ), Warsaw, Poland
4 UPMC Univ. Paris 06, Faculté de Physique, 75252 Paris, France
Published online: 21 March 2016
Photoproduction of a pair of particles with large invariant mass is a natural extension of collinear QCD factorization theorems which have been much studied for deeply virtual Compton scattering and deeply virtual meson production. We discuss the production of a photon and a meson, where the wide angle Compton scattering on a meson subprocess factorizes from generalized parton distribution. We calculate at dominant twist and leading order in αs, the production cross-section of a transversely polarized ρ meson which is sensitive to chiral-odd GPDs, and show that it may be measurable in near future JLab experiments.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.