Strange-quark asymmetry in the proton in chiral effective theory

X. G. Wang, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu, A. W. Thomas, and P. Wang
Phys. Rev. D 94, 094035 – Published 29 November 2016

Abstract

We perform a comprehensive analysis of the strange-antistrange parton distribution function (PDF) asymmetry in the proton in the framework of chiral effective theory, including the full set of lowest-order kaon loop diagrams with off-shell and contact interactions, in addition to the usual on-shell contributions previously discussed in the literature. We identify the presence of δ-function contributions to the s¯ PDF at x=0, with a corresponding valencelike component of the s-quark PDF at larger x, which allows greater flexibility for the shape of ss¯. Expanding the moments of the PDFs in terms of the pseudoscalar kaon mass, we compute the leading nonanalytic behavior of the number and momentum integrals of the s and s¯ distributions, consistent with the chiral symmetry of QCD. We discuss the implications of our results for the understanding of the NuTeV anomaly and for the phenomenology of strange-quark PDFs in global QCD analysis.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 3 April 2016

DOI:https://doi.org/10.1103/PhysRevD.94.094035

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

X. G. Wang1, Chueng-Ryong Ji2, W. Melnitchouk3, Y. Salamu4, A. W. Thomas1, and P. Wang4,5

  • 1CoEPP and CSSM, University of Adelaide, Adelaide 5005, Australia
  • 2North Carolina State University, Raleigh, North Carolina 27695, USA
  • 3Jefferson Lab, Newport News, Virginia 23606, USA
  • 4Institute of High Energy Physics, CAS, Beijing 100049, China
  • 5Theoretical Physics Center for Science Facilities, CAS, Beijing 100049, China

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 94, Iss. 9 — 1 November 2016

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×