Speaker
Description
A quantitative explanation of the effects observed in nuclear DIS requires the presence of an in-medium nuclear modification of parton distribution functions, extending beyond the traditional Fermi motion and binding correction. We will discuss nuclear DIS basing on a microscopic model [1] taking into account the energy-momentum spectrum of bound nucleons, off-shell modification of bound nucleon structure functions, corrections from meson-exchange currents as well as the corrections from propagation of quark-gluon states in nuclear environment. The off-shell correction, which provides a mechanism of the modifications of the partonic structure in bound protons and neutrons, can be constrained from a global QCD analysis together with the PDFs in the proton. The new data from MARATHON experiment on the EMC effect for 3He/2H and 3H/2H allows to better constrain F2n/F2p in the region of large Bjorken x, as well as to improve the accuracy in the determination of the isoscalar nucleon off-shell function, its proton-neutron asymmetry, and ts interplay with the higher-twist terms in the structure functions. We discuss a number of applications including lepton-nucleus DIS, Drell-Yan production in proton-nucleus collisions, and $W^\pm, Z^0$ boson production in p+Pb collisions at the LHC.
References
[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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