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Parton model contributions as next-to-eikonal corrections to the dipole factorization of DIS and SIDIS at low xBj

Tolga Altinoluk1, Guillaume Beuf1, and Swaleha Mulani1,2,3

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Phys. Rev. D 113, 034011 – Published 9 February, 2026

DOI: https://doi.org/10.1103/15qz-1krh

Abstract

We compute the next-to-eikonal (NEik) power corrections to inclusive deep inelastic scattering (DIS) and semi-inclusive deep inelastic scattering (SIDIS) at low x beyond dipole factorization, which represent the eikonal result. The analysis is restricted to contributions arising from t-channel quark exchanges, thereby probing the quark background field of the target. For a transversely polarized virtual photon, the NEik corrections to inclusive DIS are expressed in terms of quark and antiquark collinear parton distribution functions, while the corresponding corrections to SIDIS are formulated in terms of the unpolarized quark transverse-momentum-dependent distribution. In contrast, for a longitudinally polarized photon, the NEik corrections to both inclusive DIS and SIDIS vanish at lowest order in αs.

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Phys. Rev. D 113, 034011– Published 9 February, 2026
  • Received 22 October 2025
  • Accepted 20 January 2026
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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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