XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

NLO description of the photoproduction of a diphoton with a large invariant mass

14 Apr 2021, 11:12

18m

Virtual (Stony Brook, NY)

Contributed Talk Spin Physics Spin Physics

Speaker

Oskar Grocholski (University of Warsaw)

Description

Photoproduction of two photons is the simplest example allowing the study of QCD factorization in a family of $2\to 3$ processes. Because of the C-symmetry, the amplitude is sensitive only to valence quarks GPDs, which makes it interesting for the GPD extraction program. Leading-order calculation, presented in [1], and the subsequent work concerning electroproduction of 2 photons [2], suggest that this process may be experimentally accessible in JLAB.

I will present a new calculation of NLO corrections [3], which provide more accurate predictions and proof of factorization for this process at the one-loop level. I will also discuss the analytical structure of the amplitude, which is way richer than the one of DVCS and TCS cases.

[1] A. Pedrak, B. Pire, L. Szymanowski, and J. Wagner: Hard photoproduction of a diphoton with a large invariant mass, Phys. Rev. D 96 (2017), 074008, Erratum Phys. Rev. D 100 (2019), 039901
[2] A. Pedrak, B. Pire, L. Szymanowski, and J. Wagner: Electroproduction of a large invariant mass photon pair, Phys. Rev. D 101 (2020) 11, 114027
[3] O. Grocholski, B. Pire, L. Szymanowski, and J. Wagner, in preparation.

Presentation materials

DIS2021_Grocholski.pdf

Youtube Link