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  • Open Access

Fragmentation contributions to transverse nucleon spin observables in semi-inclusive deep-inelastic scattering at NLO

Diego Scantamburlo* and Marc Schlegel†

  • *Contact author: diego.scantamburlo@student.uni-tuebingen.de
  • †Contact author: marc.schlegel@uni-tuebingen.de
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Phys. Rev. D 113, 114036 – Published 22 June, 2026

DOI: https://doi.org/10.1103/9n3x-4xv8

Abstract

We study the spin-dependent cross section in semi-inclusive deep-inelastic lepton-nucleon collisions, ℓ+N↑→ℓ+h+X. We focus on the cross section that is integrated over the transverse momentum Ph⊥ of the detected unpolarized hadron. We analyze this cross section at large virtuality Q2 of the exchanged virtual photon within the framework of collinear twist-3 factorization in perturbative QCD. The two main transverse spin observables, the single nucleon spin asymmetry, and the double longitudinal lepton-transverse nucleon spin asymmetry, both receive contributions from chiral-odd twist-3 three-parton fragmentation functions. We study these fragmentation contributions to next-to-leading order (NLO) in perturbative QCD. We explicitly observe that collinear twist-3 factorization holds for these contributions at the one-loop level. We confront our NLO formulas with HERMES data and provide numerical predictions for EIC kinematics.

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Phys. Rev. D 113, 114036– Published 22 June, 2026
  • Received 18 March 2026
  • Accepted 14 May 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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