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Title: Constraints on the ss¯ asymmetry of the proton in chiral effective theory

Here, we compute the $$s-\bar s$$ asymmetry in the proton in chiral effective theory, using available phenomenological constraints from existing data. Unlike previous meson cloud model calculations, which accounted for kaon loop contributions with on-shell intermediate states, our formalism includes off-shell and contact interactions, which impact the shape of the $$s-\bar s$$ difference. Using a finite-range regularization procedure that preserves chiral symmetry and Lorentz invariance, we find that existing data limit the integrated value of the first moment of the asymmetry to the range $$-0.07 \times 10^{-3} \leq \langle x(s-\bar s) \rangle \leq 1.12 \times 10^{-3}$$ at a scale of $Q^2=1$~GeV$^2$. In contrast to some suggestions in the literature, the magnitude of this correction is too small to account for the NuTeV anomaly.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. CoEPP and CSSM, Univ. of Adelaide (Australia)
  2. North Carolina State Univ., Raleigh, NC (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. CAS, Beijing (China). Institute of High Physics
  5. CAS, Beijing (China). Institute of High Physics and Theoretical Physics Center for Science Facilities
Publication Date:
Report Number(s):
JLAB-THY-16-2220; DOE/OR/23177-3679; arXiv:1602.06646; ADP-16-11-T966
Journal ID: ISSN 0370-2693; PII: S0370269316305081
Grant/Contract Number:
AC05-06OR23177; FG02-03ER41260; CE110001104; FL0992247; DP151103101; 11475186
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 762; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
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
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; strange asymmetry; chiral symmetry; Kaon loops
OSTI Identifier:
1325318
Alternate Identifier(s):
OSTI ID: 1326567