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arXiv · 2504.17123

Soft-Photon Contribution into Two-Photon Exchange Corrections for Azimuthal Asymmetries of SIDIS

Stinson Lee·Andrei Afanasev
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Abstract

It is demonstrated that two-photon exchange (TPE) corrections to the cross-section of unpolarized semi-inclusive deep-inelastic scattering (SIDIS) generate azimuthal-dependent terms and the corresponding $\braket{{\cos{(n\phi)}}}$ moments. A quark-diquark model of a nucleon was used in the calculations along with a soft-photon approximation. The infrared divergences in the intermediate steps of calculation are regularized with the fictitious photon mass that cancels out in the final result when the soft-photon bremsstrahlung process and interference terms are added. The calculations employ Mathematica ``LoopTools" package to evaluate the loop integrals. TPE corrections are analyzed in the kinematics of planned experiments at Jefferson Lab.

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Stinson Lee, Andrei Afanasev. 2025-04-23. Soft-Photon Contribution into Two-Photon Exchange Corrections for Azimuthal Asymmetries of SIDIS. https://arxiv.org/abs/2504.17123

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