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Phenomenology of diphoton photoproduction at next-to-leading order

Abstract : We develop the analysis of diphoton exclusive photoproduction in the kinematics where a collinear QCD factorization framework applies, namely nearly forward large invariant mass diphoton production. We work at the leading twist level and at the next-to-leading order (NLO) in the strong coupling constant alpha_S. We compare our predictions for cross-sections with Born order calculations for the experimental conditions accessible to JLab experiments and show the interesting sensitivity of our results to various models of generalized parton distributions (GPDs). The NLO corrections are rather large and negative but do not prevent the studied reaction from being a promising tool for the extraction of C-dd GPDs, which do not contribute to either spacelike or timelike deeply virtual Compton scattering amplitudes.
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Contributor : Bernard Pire Connect in order to contact the contributor
Submitted on : Tuesday, April 5, 2022 - 2:15:55 PM
Last modification on : Tuesday, May 24, 2022 - 8:29:09 AM

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  • HAL Id : hal-03631119, version 1
  • ARXIV : 2204.00396



Oskar Grocholski, Bernard Pire, Paweł Sznajder, Lech Szymanowski, Jakub Wagner. Phenomenology of diphoton photoproduction at next-to-leading order. Physical Review D, American Physical Society, 2022, 105, pp.094025. ⟨hal-03631119⟩



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