Journal
PHYSICAL REVIEW D
Volume 104, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.114006
Keywords
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Funding
- Diamond Grant program
- National Science Center in Poland [2019/33/B/ST2/02588, 2017/26/M/ST2/01074]
- Polish-French collaboration agreements Polonium
- Polish National Agency for Academic Exchange
- European Union [824093]
- COPIN-IN2P3
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This study calculates the amplitude for the photoproduction of a near forward large mass diphoton at leading twist and next to leading order in the framework of collinear factorization. The validity of factorization at this order is demonstrated, with the NLO result probing the whole domain of definition of quark GPDs with both real and imaginary parts. Phenomenology of the results for medium (JLab) and higher energy (EIC) experiments will be developed in future studies.
We calculate in the framework of collinear factorization the amplitude for the photoproduction of a near forward large mass diphoton at leading twist and next to leading order (NLO) in alpha(s). We demonstrate the validity of factorization at this order, which was never achieved for such a reaction where the coefficient function describes a 2 -> 3 hard process. While the Born order amplitude was purely imaginary and only probed the x = +/-xi cross-over line of generalized parton distributions (GPD) domain, the NLO result contains both a real and an imaginary part and probes the whole domain of definition of quark GPDs. The phenomenology of our results for medium (JLab) and higher energy (EIC) experiments will be developed in a future study.
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