Apr 8 – 12, 2024
Maison MINATEC, Grenoble, FRANCE
Europe/Paris timezone

On the interplay of nuclear and higher-twist corrections in nuclear DIS at large x

Apr 10, 2024, 12:20 PM
Maison MINATEC, Grenoble, FRANCE

Maison MINATEC, Grenoble, FRANCE

3 Parv. Louis Néel, 38054 Grenoble
Regular parallel talk WG1: Structure Functions and Parton Densities WG1


Roberto Petti


We study nuclear DIS basing on a microscopic model [1], which addresses a number of nuclear corrections arising from energy-momentum spectrum of bound nucleons, off-shell modification of bound nucleon structure functions, corrections from meson-exchange currents, focusing on the region of large Brorken x and the light nuclei with two and three bound nucleons, for which the energy-momentum distributions are known with a good accuracy. The off-shell correction responsible for the modifications of the partonic structure in bound protons and neutrons is constrained from a global QCD analysis together with the PDFs in the proton. In the analysis including the deuterium (2H), tritium (3H) and helium-3 (3He) data we constrain the individual off-shell effects for the proton and neutron and study its interplay with the higher-twist terms in the structure functions. We found a negligible proton-neutron asymmetry in the relative off-shell effect and demonstrate an excellent description of nuclear data with a single isoscalar off-shell function [2-4]. The inclusion of the new data from MARATHON experiment on the ratios of nuclear cross sections 3He/2H and 3H/2H allows to increase accuracy of the determination of the universal nucleon off-shell function which drives nuclear corrections for all nuclei. We also provide our predictions on the neutron/proton ratio of structure functions F2n/F2p and on the d and u quark distributions in the proton and in the 3H and 3He nuclei.


[1] S.A. Kulagin and R. Petti, Nucl. Phys. A765 (2006) 126.
[2] S.I. Alekhin, S.A. Kulagin, R.Petti, Phys. Rev. D96 (2017) 054005.
[3] S.I. Alekhin, S.A. Kulagin, R.Petti, Phys. Rev. D105 (2022) 114037.
[4] S.I. Alekhin, S.A. Kulagin, R.Petti, Phys. Rev. D107 (2023) L051506.

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