Phenomenology of diphoton photoproduction at next-to-leading order
| Autor: | O. Grocholski, B. Pire, P. Sznajder, L. Szymanowski, J. Wagner |
|---|---|
| Přispěvatelé: | Pire, Bernard |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
generalized parton distribution
parton: distribution function FOS: Physical sciences collinear strong interaction coupling constant High Energy Physics - Phenomenology (hep-ph) strong interaction: coupling constant 13.60.Fz 13.88.+e deeply virtual Compton scattering quantum chromodynamics: factorization strong coupling ddc:530 Nuclear Experiment two-photon parton distribution function factorization [quantum chromodynamics] quantum chromodynamics factorization scattering amplitude higher-order: 1 sensitivity [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] High Energy Physics - Phenomenology higher-order 1 12.38.Bx kinematics twist High Energy Physics::Experiment distribution function [parton] coupling constant [strong interaction] 1 [higher-order] photoproduction Jefferson Lab |
| Zdroj: | Physical review / D 105(9), 094025 (2022). doi:10.1103/PhysRevD.105.094025 Physical Review |
| DOI: | 10.3204/pubdb-2022-01702 |
| Popis: | Physical review / D 105(9), 094025 (2022). doi:10.1103/PhysRevD.105.094025 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–odd GPDs, which do not contribute to either spacelike or timelike deeply virtual Compton scattering amplitudes. Published by Inst., Melville, NY |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|