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

Title: 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.

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

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

Grant/Contract Number:: AC05-06OR23177; FG02-03ER41260; CE110001104; FL0992247; DP151103101; 313800/2014-6; 400826/2014-3; 11475186; CRC 110

OSTI ID:: 1337930

Alternate ID(s):: OSTI ID: 1333773

Report Number(s):: JLAB-THY-16-2357; DOE/OR/23177-3956; arXiv:1610.03333; ADP-16-35/T991; PRVDAQ; TRN: US1701200

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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The quark - antiquark asymmetry of the strange sea of the nucleon Cao, F. G.; Signal, A. I. arXiv https://doi.org/10.48550/arxiv.hep-ph/0302206	text	January 2003
Pion and sigma meson properties in a relativistic quark model Faessler, Amand; Gutsche, Th.; Ivanov, M. A. arXiv https://doi.org/10.48550/arxiv.hep-ph/0304031	text	January 2003
Strange quark asymmetry in the nucleon and the NuTeV anomaly Alwall, Johan; Ingelman, Gunnar arXiv https://doi.org/10.48550/arxiv.hep-ph/0407364	text	January 2004
The Spin Structure of the Proton Bass, Steven D. arXiv https://doi.org/10.48550/arxiv.hep-ph/0411005	text	January 2004
Strangeness in the Nucleon on the Light-Cone Melnitchouk, W.; Malheiro, M. arXiv https://doi.org/10.48550/arxiv.hep-ph/9610331	text	January 1996
K^* Mesons and Nucleon Strangeness Barz, L. L.; Forkel, H.; Hammer, H. -W. arXiv https://doi.org/10.48550/arxiv.hep-ph/9803221	text	January 1998
Parton distributions: a new global analysis Martin, A. D.; Roberts, R. G.; Stirling, W. J. arXiv https://doi.org/10.48550/arxiv.hep-ph/9803445	text	January 1998
A new global analysis of deep inelastic scattering data Barone, V.; Pascaud, C.; Zomer, F. arXiv https://doi.org/10.48550/arxiv.hep-ph/9907512	text	January 1999
The SAMPLE Experiment and Weak Nucleon Structure Beise, E. J.; Pitt, M. L.; Spayde, D. T. arXiv https://doi.org/10.48550/arxiv.nucl-ex/0412054	text	January 2004
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Chiral Corrections to Matrix Elements of Twist-2 Operators Arndt, Daniel; Savage, Martin J. arXiv https://doi.org/10.48550/arxiv.nucl-th/0105045	text	January 2001
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The sea of quarks and antiquarks in the nucleon Geesaman, D. F.; Reimer, P. E. Reports on Progress in Physics, Vol. 82, Issue 4 https://doi.org/10.1088/1361-6633/ab05a7	journal	March 2019
Nucleon parton distributions from hadronic quantum fluctuations Ekstedt, Andreas; Ghaderi, Hazhar; Ingelman, Gunnar Physical Review D, Vol. 100, Issue 3 https://doi.org/10.1103/physrevd.100.034003	journal	August 2019
The isospin strange asymmetry from the chiral effective theory Trevisan, Luis Augusto; Tarrillo, Carlos A. Mirez CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST), AIP Conference Proceedings https://doi.org/10.1063/1.5118407	conference	January 2019
Nucleon parton distributions from hadronic quantum fluctuations Ekstedt, Andreas; Ghaderi, Hazhar; Ingelman, Gunnar arXiv https://doi.org/10.48550/arxiv.1807.06589	text	January 2018
The Spin Budget of the Proton at NNLO and Beyond de Florian, Daniel; Vogelsang, Werner arXiv https://doi.org/10.48550/arxiv.1902.04636	text	January 2019

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