On the shape of the d ¯ − u ¯ asymmetry

Accardi, A.; Keppel, C. E.; Li, S.; Melnitchouk, W.; Niculescu, G.; Niculescu, I.; Owens, J. F.

doi:10.1016/j.physletb.2019.135143

Title: On the shape of the $\bar{d} - \bar{u}$ asymmetry

Journal Article · Sat Feb 01 00:00:00 EST 2020 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2019.135143· OSTI ID:1577928

Accardi, A.; Keppel, C. E.;

; Melnitchouk, W.; Niculescu, G.; Niculescu, I.; Owens, J. F.

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 $$\bar d-\bar u$$ 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, and Fermilab Drell-Yan lepton-pair production cross sections, suggests that existing data can be well described with $$\bar d > \bar u$$ for all values of x currently accessible. We compare the shape of the fitted $$\bar d-\bar u$$ 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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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: CTEQ-Jefferson Lab (CJ) Collaboration

Grant/Contract Number:: AC05-06OR23177; SC0008791; PHY-1913257

OSTI ID:: 1577928

Alternate ID(s):: OSTI ID: 1581145

Report Number(s):: JLAB-THY-19-3053; DOE/OR/23177-4777; arXiv:1910.02931; S0370269319308652; 135143; PII: S0370269319308652

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Vol. 801 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 3 works

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