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  • Letter
  • Open Access

Off-shell effects in bound nucleons and parton distributions from H1, H2, H3, and He3 data

S. I. Alekhin1, S. A. Kulagin2, and R. Petti3

  • 1II. Institut für Theoretische Physik, Universität Hamburg, D–22761 Hamburg, Germany
  • 2Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia
  • 3Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA

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Phys. Rev. D 107, L051506 – Published 27 March, 2023

DOI: https://doi.org/10.1103/PhysRevD.107.L051506

Abstract

We report the results of a new global QCD analysis including deep-inelastic scattering data off H1, H2, H3, and He3 targets. Nuclear corrections are treated in terms of a nuclear convolution approach with off-shell bound nucleons. The off-shell (OS) corrections responsible for the modification of the structure functions (SFs) of bound nucleons are constrained in a global fit along with the proton parton distribution functions (PDFs) and the higher-twist (HT) terms. We investigate the proton-neutron difference for the OS correction and discuss our predictions for the SF ratio F2n/F2p and the corresponding PDF ratio d/u in the proton, as well as their correlations with the underlying treatment of the HT terms and of the OS corrections. In particular, we find that the recent MARATHON data are consistent with equal relative OS corrections for both the proton and the neutron.

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Phys. Rev. D 107, L051506– Published 27 March, 2023
  • Received 19 November 2022
  • Accepted 28 February 2023
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