Crnković, Nikola; Duplančić, Goran; Nabeebaccus, Saad; Passek-K., Kornelija; Pire, Bernard; Szymanowski, Lech; Wallon, Samuel (2026) Hard exclusive photoproduction of photon-meson pairs: Pseudoscalar channels π , η , and η′. Physical Review D, 113 (3). ISSN 2470-0010
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Abstract
We investigate the hard exclusive photoproduction of photon-meson pairs at leading twist and leading order in perturbative QCD and focus on pseudoscalar mesons M is an element of {pi +/-,pi 0, eta, eta'}. Compact analytical expressions are obtained for the amplitudes involving quark generalized parton distributions, with the twogluon components of the eta and eta' distribution amplitudes included. The numerical analysis is performed in the moderate-xi region, where valence-quark generalized parton distributions are expected to be important. In this region, we find a strong impact of the pion-pole term in gamma pi +/- production and a non-negligible effect for neutral mesons. We also observe a marked dependence of gamma eta' photoproduction on two-gluon contributions. This process offers enhanced sensitivity to the shape of the generalized parton distributions already at leading order, while the tested dependence on the meson distribution amplitude and the renormalization scale introduces further theoretical uncertainties, the latter emphasizing the need for next-to-leading-order corrections. Our results provide a concise analytical framework and a numerical baseline for future studies.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | cess amplitudes; compton-scattering; perturbative qcd; electropoduction; transition | ||||||||
| Subjects: | NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields | ||||||||
| Divisions: | Theoretical Physics Division | ||||||||
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| Depositing User: | Ema Buhin Šaler | ||||||||
| Date Deposited: | 23 Feb 2026 08:34 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/11238 | ||||||||
| DOI: | 10.1103/g9m4-9r9c |
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