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Soft-photon contribution into two-photon exchange corrections for azimuthal asymmetries of SIDIS

Stinson Lee and Andrei Afanasev

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Phys. Rev. D 111, 113008 – Published 27 June, 2025

DOI: https://doi.org/10.1103/4pwj-vp5p

Abstract

It is demonstrated that two-photon exchange (TPE) corrections to the cross-section of unpolarized semi-inclusive deep-inelastic scattering generate azimuthal-dependent terms and the corresponding ⟨cos(nϕ)⟩ 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 the 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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Phys. Rev. D 111, 113008– Published 27 June, 2025
  • Received 23 April 2025
  • Accepted 3 June 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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