Journal Article

PUBDB-2025-00462

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The two-loop coefficient functions for double deeply virtual Compton scattering

Braun, V. M. (Corresponding author) ; Jiang, H.-Y. ; Manashov, A.Extern* ; von Manteuffel, A.

2025
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1007/JHEP01(2025)069  doi:10.3204/PUBDB-2025-00462

Report No.: DESY-24-178; arXiv:2411.14985

Abstract: Making use of conformal symmetry of large-n$_{f}$ 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 $ \overline{\textrm{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.

Keyword(s): Factorization ; Renormalization Group ; Higher-Order Perturbative Calculations ; Scale and Conformal Symmetries ; Specific QCD Phenomenology

Note: 38 pages, 2 figures. arXiv admin note: text overlap with arXiv:2007.06348

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Contributing Institute(s):

1. Uni Hamburg / Theorie (UNI/TH)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)430824754 - Neue Zugänge zu semi-inklusiven Streuprozessen am Electron-Ion-Collider (EIC) (430824754) (430824754)
3. DFG project G:(GEPRIS)409651613 - FOR 2926: Next Generation Perturbative QCD for Hadron Structure: Preparing for the Electron-Ion Collider (409651613) (409651613)

Experiment(s):

1. DORIS Beamline G3 (DORIS III)

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; ; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Braun, V. (Corresponding author)Extern* ; Jiang, H.-Y. ; Manashov, A.Extern* ; von Manteuffel, A.Extern*
The two-loop coefficient function for double deeply virtual Compton scattering
[10.3204/PUBDB-2024-06709]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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