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Accardi, A.; Keppel, C.E.; Li, S.; Melnitchouk, W.; Niculescu, G.; Niculescu, I.; Owens, J.F.
Physics letters. B, 02/2020, Volume: 801, Issue: CJournal Article
Using data from a recent reanalysis of neutron structure functions extracted from inclusive proton and deuteron deep-inelastic scattering (DIS), we re-examine the constraints on the shape of the d¯−u¯ asymmetry in the proton at large parton momentum fractions x. A global analysis of the proton–neutron structure function difference from BCDMS, NMC, SLAC and Jefferson Lab DIS measurements, and of Fermilab Drell-Yan lepton-pair production cross sections, suggests that existing data can be well described with d¯>u¯ for all values of x currently accessible. We compare the shape of the fitted d¯−u¯ distributions with expectations from nonperturbative models based on chiral symmetry breaking, which can be tested by upcoming Drell-Yan data from the SeaQuest experiment at larger values of x.
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