TY  - JOUR
AU  - Braun, Vladimir M.
AU  - Jiang, Hua-Yu
AU  - Manashov, Alexander
AU  - von Manteuffel, Andreas
TI  - The two-loop coefficient functions for double deeply virtual Compton scattering
JO  - Journal of high energy physics
VL  - 01
IS  - 1
SN  - 1126-6708
CY  - Heidelberg
PB  - Springer
M1  - PUBDB-2025-00462
M1  - arXiv:2411.14985
M1  - DESY-24-178
SP  - 069
PY  - 2025
N1  - 38 pages, 2 figures. arXiv admin note: text overlap with arXiv:2007.06348
AB  - Making use of conformal symmetry of large-n<sub>f</sub> QCD in d = 4 – 2ϵ dimensions at the Wilson-Fischer fixed point, we calculate the two-loop coefficient functions in the operator product expansion of two electromagnetic currents in general kinematics with two different photon virtualities. This result is necessary for the description of the double deeply virtual Compton scattering to the next-to-next-to-leading order accuracy, but is also interesting for a range of other two-photon processes. We present analytic expression for the coefficient function in momentum fraction space in the ―MS  scheme and study its numerical impact on the Compton form factors for a simple model of the generalized parton distributions. The calculated corrections turn out to be large and are significant for the kinematics of proposed experiments.
KW  - Factorization (autogen)
KW  - Renormalization Group (autogen)
KW  - Higher-Order Perturbative Calculations (autogen)
KW  - Scale and Conformal Symmetries (autogen)
KW  - Specific QCD Phenomenology (autogen)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001396241300001
DO  - DOI:10.1007/JHEP01(2025)069
UR  - https://bib-pubdb1.desy.de/record/622768
ER  -