Hunting for an EMC-like effect for antiquarks
arXiv:2210.12597 · doi:10.1016/j.physletb.2023.137935
Abstract
We argue that the Drell-Yan process in the kinematics recently studied at FNAL by the E906/SeaQuest experiment may allow to observe an analogous of the EMC effect for antiquarks. The effects of Fermi motion and energy loss are considered. The preliminary E906/SeaQuest data are inconsistent with the growth of the ratio expected in the Fermi motion scenario at . The pattern of the dependence of the ratio seems also inconsistent with a scenario in which the dominant nuclear effect is a suppression of the cross section due to the energy loss experienced by a quark of the projectile proton involved in the Drell-Yan process. All together the data suggest the possibility of a modification of the antiquark parton distributions in nuclei, with a pattern similar to the one observed in the EMC effect. We argue that optimal kinematics to look for an antiquark EMC-like effect would be to measure the ratios for = 0.2-0.4 and constant.
arXiv comment22 pages, 5 figures
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