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Title: On the shape of the d ¯ u ¯ asymmetry

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [4];  [4];  [5]
  1. Hampton Univ., Hampton, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Univ. of New Hampshire, Durham, NH (United States)
  4. James Madison Univ., Harrisonburg, VA (United States)
  5. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
CTEQ-Jefferson Lab (CJ) Collaboration
OSTI Identifier:
1577928
Alternate Identifier(s):
OSTI ID: 1581145
Report Number(s):
JLAB-THY-19-3053; DOE/OR/23177-4777; arXiv:1910.02931
Journal ID: ISSN 0370-2693
Grant/Contract Number:  
AC05-06OR23177; SC0008791; PHY-1913257
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 801; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Accardi, Alberto, Keppel, Cynthia, Li, Shujie, Melnitchouk, Wally, Niculescu, Gabriel, Niculescu, Ioana, and Owens, Joseph F. On the shape of the d¯–u¯ asymmetry. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2019.135143.
Accardi, Alberto, Keppel, Cynthia, Li, Shujie, Melnitchouk, Wally, Niculescu, Gabriel, Niculescu, Ioana, & Owens, Joseph F. On the shape of the d¯–u¯ asymmetry. United States. doi:10.1016/j.physletb.2019.135143.
Accardi, Alberto, Keppel, Cynthia, Li, Shujie, Melnitchouk, Wally, Niculescu, Gabriel, Niculescu, Ioana, and Owens, Joseph F. Tue . "On the shape of the d¯–u¯ asymmetry". United States. doi:10.1016/j.physletb.2019.135143.
@article{osti_1577928,
title = {On the shape of the d¯–u¯ asymmetry},
author = {Accardi, Alberto and Keppel, Cynthia and Li, Shujie and Melnitchouk, Wally and Niculescu, Gabriel and Niculescu, Ioana and Owens, Joseph F.},
abstractNote = {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.},
doi = {10.1016/j.physletb.2019.135143},
journal = {Physics Letters B},
number = C,
volume = 801,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.135143

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