Preprint

PUBDB-2024-06709

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

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

2024

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-06709

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

Abstract: 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.

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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)

Appears in the scientific report 2024

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Braun, V. M. (Corresponding author) ; Jiang, H.-Y. ; Manashov, A.Extern* ; von Manteuffel, A.
The two-loop coefficient functions for double deeply virtual Compton scattering
Journal of high energy physics 01(1), 069 (2025) [10.1007/JHEP01(2025)069]2025     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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