Probing chiral-even and chiral-odd leading twist quark generalized parton distributions through the exclusive photoproduction of a γρ pair
| Autor: | Goran Duplančić, Saad Nabeebaccus, Kornelija Passek-Kumerički, Bernard Pire, Lech Szymanowski, Samuel Wallon |
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| Rok vydání: | 2023 |
| Zdroj: | Physical Review |
| ISSN: | 2470-0029 2470-0010 |
| Popis: | We extend our studies of a new class of 2→3 exclusive processes using the collinear factorization framework by considering the exclusive photoproduction of a γρ pair, in the kinematics where the pair has a large invariant mass, and the outgoing ρ meson has a sufficiently large transverse momentum to not resonate with the nucleon. We cover the whole kinematical range from medium energies in fixed-target experiments to very large energies of colliders, by considering the experimental conditions of JLab 12-GeV, COMPASS, and future EIC and LHC (in ultra-peripheral collisions) cases. One of the main interests in studying the present process is that it provides access to both chiral-even and chiral-odd generalized parton distributions, depending on the polarization of the outgoing ρ meson, both at leading twist. Our analysis covers both neutral and charged ρ mesons. We find that the orders of magnitude of the obtained cross sections are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab, for both longitudinally and transversely polarized ρ. Furthermore, we compute the linear photon beam polarization asymmetry which is sizable for a longitudinally polarized meson. These predictions are obtained for both the asymptotic distribution amplitude (DA) and the holographic DA. |
| Databáze: | OpenAIRE |
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