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Title: $$\bar d - \bar u$$ asymmetry in the proton in chiral effective theory

We compute the $$\bar d - \bar u$$ asymmetry in the proton in chiral effective theory, including both nucleon and Δ degrees of freedom, within both relativistic and heavy baryon frameworks. In addition to the distribution at $x>0$, we estimate the correction to the integrated asymmetry arising from zero momentum contributions from pion rainbow and bubble diagrams at $x=0$, which have not been accounted for in previous analyses. In conclusion, we find that the empirical $x$ dependence of $$\bar d - \bar u$$ as well as the integrated asymmetry can be well reproduced in terms of a transverse momentum cutoff parameter.
 [1] ;  [2] ;  [3] ;  [4]
  1. Institute of High Energy Physics, CAS, Beijing (China)
  2. North Carolina State Univ., Raleigh, NC (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Institute of High Energy Physics, Beijing (China); Theoretical Physics Center for Science Facilities, CAS, Beijing (China)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY--14-1954; DOE/OR/23177--3180; arXiv:1409.5885
Journal ID: ISSN 0031-9007; PRLTAO; ArticleNumber: 122001
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 114; Journal Issue: 12
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States