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arXiv · 2404.08597

Polarized semi-inclusive deep-inelastic scattering at NNLO in QCD

Leonardo Bonino·Thomas Gehrmann·Markus Löchner·Kay Schönwald·Giovanni Stagnitto
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Abstract

Semi-inclusive hadron production in longitudinally polarized deep-inelastic lepton-nucleon scattering is a powerful tool for resolving the quark flavor decomposition of the proton's spin structure. We present the full next-to-next-to-leading order (NNLO) QCD corrections to the coefficient functions of polarized semi-inclusive deep-inelastic scattering (SIDIS) in analytical form, enabling the use of SIDIS measurements in precision studies of the proton spin structure. The numerical impact of these corrections is illustrated by a comparison with data of polarized single-inclusive hadron spectra from the DESY HERMES and CERN COMPASS experiments.

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Leonardo Bonino, Thomas Gehrmann, Markus Löchner, Kay Schönwald, Giovanni Stagnitto. 2024-04-12. Polarized semi-inclusive deep-inelastic scattering at NNLO in QCD. https://doi.org/10.1103/physrevlett.133.211904

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