Probing chiral-even and chiral-odd leading twist quark generalized parton distributions through the exclusive photoproduction of a γρ pair

Duplančić, Goran; Nabeebaccus, Saad; Passek-Kumerički, Kornelija; Pire, Bernard; Szymanowski, Lech; Wallon, Samuel (2023) Probing chiral-even and chiral-odd leading twist quark generalized parton distributions through the exclusive photoproduction of a γρ pair. Physical Review D, 107 (9). ISSN 2470-0010

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Abstract

We extend our studies of a new class of 2→3 exclusive processes using the collinear factorisation 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, future EIC and LHC (in ultra-peripheral collisions) cases. One of the main interest in studying the present process is that it provides access to both chiral-even and chiral-odd GPDs, depending on the polarisation of the outgoing ρ-meson, both at leading twist. Our analysis covers both neutral and charged ρ-mesons. We find that the order 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 polarised ρ. Furthermore, we compute the linear photon beam polarisation asymmetry which is sizeable for a longitudinally polarised meson. These predictions are obtained for both asymptotic distribution amplitude (DA) and the holographic DA.

Item Type:	Article
Uncontrolled Keywords:	QCD phenomenology; Generalized parton distributions (GPD); Photon-meson photoproduction
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Razotkrivanje strukture hadrona pomoću tvrdih ekskluzivnih procesa-REVESTRUCTURE Kornelija Passek-Kumerički IP-2019-04-9709 HRZZ The strong interaction at the frontier of knowledge: fundamental research and applications-STRONG-2020 Kornelija Passek-Kumerički 824093 EK
Depositing User:	Kornelija Passek-Kumerički
Date Deposited:	07 Feb 2024 09:22
URI:	http://fulir.irb.hr/id/eprint/8507
DOI:	10.1103/PhysRevD.107.094023

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