%0 Electronic Article
%A Braun, Vladimir
%A Jiang, Hua-Yu
%A Manashov, Alexander
%A von Manteuffel, Andreas
%T The two-loop coefficient function for double deeply virtual Compton scattering
%N DESY-24-178
%M PUBDB-2024-06709
%M DESY-24-178
%M arXiv:2411.14985
%D 2024
%X Making use of conformal symmetry of large-n f QCD in d = 4 − 2ϵ dimensions atthe Wilson-Fischer fixed point, we calculate the two-loop coefficient function in the operatorproduct expansion of two electromagnetic currents in a general kinematics with two differentphoton virtualities. This result is necessary for the description of the double deeply virtualCompton scattering to the next-to-next-to-leading order accuracy, but is also interesting fora range of other two-photon processes. We present analytic expression for the coefficientfunction in momentum fraction space in the MS scheme and study its numerical impacton the Compton form factors for a simple model of the generalized parton distribution. Thecalculated corrections turn out to be large and are significant in the kinematics of the proposedexperiments.
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2024-06709
%U https://bib-pubdb1.desy.de/record/617343