Strange-quark asymmetry in the proton in chiral effective theory
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 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.
- Authors:
-
- 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
- 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)
- OSTI Identifier:
- 1337930
- Alternate Identifier(s):
- OSTI ID: 1333773
- Report Number(s):
- JLAB-THY-16-2357; DOE/OR/23177-3956; arXiv:1610.03333; ADP-16-35/T991
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1701200
- Grant/Contract Number:
- AC05-06OR23177; FG02-03ER41260; CE110001104; FL0992247; DP151103101; 313800/2014-6; 400826/2014-3; 11475186; CRC 110
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 9; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Wang, X. G., Ji, Chueng -Ryong, Melnitchouk, W., Salamu, Y., Thomas, A. W., and Wang, P. Strange-quark asymmetry in the proton in chiral effective theory. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.94.094035.
Wang, X. G., Ji, Chueng -Ryong, Melnitchouk, W., Salamu, Y., Thomas, A. W., & Wang, P. Strange-quark asymmetry in the proton in chiral effective theory. United States. https://doi.org/10.1103/PhysRevD.94.094035
Wang, X. G., Ji, Chueng -Ryong, Melnitchouk, W., Salamu, Y., Thomas, A. W., and Wang, P. Tue .
"Strange-quark asymmetry in the proton in chiral effective theory". United States. https://doi.org/10.1103/PhysRevD.94.094035. https://www.osti.gov/servlets/purl/1337930.
@article{osti_1337930,
title = {Strange-quark asymmetry in the proton in chiral effective theory},
author = {Wang, X. G. and Ji, Chueng -Ryong and Melnitchouk, W. and Salamu, Y. and Thomas, A. W. and Wang, P.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.94.094035},
journal = {Physical Review D},
number = 9,
volume = 94,
place = {United States},
year = {Tue Nov 29 00:00:00 EST 2016},
month = {Tue Nov 29 00:00:00 EST 2016}
}
Web of Science
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