Strange-quark asymmetry in the proton in chiral effective theory

Wang, X. G.; Ji, Chueng -Ryong; Melnitchouk, W.; Salamu, Y.; Thomas, A. W.; Wang, P.

doi:10.1103/PhysRevD.94.094035

Strange-quark asymmetry in the proton in chiral effective theory

Journal Article · Tue Nov 29 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.94.094035· OSTI ID:1337930

Wang, X. G. ^[1]; Ji, Chueng -Ryong ^[2]; Melnitchouk, W. ^[3]; Salamu, Y. ^[4]; Thomas, A. W. ^[5]; Wang, P. ^[6]

Univ. of Adelaide, Adelaide (Australia). CoEPP and CSSM
North Carolina State Univ., Raleigh, NC (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
CAS, Beijing (China). Institute of High Energy Physics
Univ. of Adelaide, Adelaide (Australia)
CAS, Beijing (China). Institute of High Energy Physics; CAS, Beijing (China). Theoretical Physics Center for Science Facilities

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 s–s¯. 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. Lastly, 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.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177; FG02-03ER41260

OSTI ID:: 1337930

Alternate ID(s):: OSTI ID: 1333773

Report Number(s):: ADP--16-35/T991; DOE/OR/23177--3956; JLAB-THY--16-2357; arXiv:1610.03333

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 9 Vol. 94; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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