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Title: Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries

Abstract

Using recently derived results for one-loop hadronic splitting functions from a nonlocal implementation of chiral effective theory, we study the contributions from pseudoscalar meson loops to flavor asymmetries in the proton. Constraining the parameters of the regulating functions by inclusive production of $n$, $$\Delta^{++}$$, $$\Lambda$$ and $$\Sigma^{*+}$$ baryons in $pp$ collisions, we compute the shape of the light antiquark asymmetry $$\bar{d}-\bar{u}$$ in the proton and the strange asymmetry $$s-\bar{s}$$ in the nucleon sea. With these constraints, the magnitude of the $$\bar{d}-\bar{u}$$ asymmetry is found to be compatible with that extracted from the Fermilab E866 Drell-Yan measurement, with no indication of a sign change at large values of $x$, and an integrated value in the range $$\langle \bar d-\bar u \rangle \approx 0.09-0.17$$. The $$s-\bar s$$ asymmetry is predicted to be positive at $x > 0$, with compensating negative contributions at $x=0$, and an integrated $x$-weighted moment in the range $$\langle x (s-\bar s) \rangle \approx (0.9-2.5) \times 10^{-3}$$.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5];  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  2. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Univ. of Adelaide, Adelaide (Australia). CoEPP and CSSM, Dept. of Physics
  5. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics and 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) (SC-26)
OSTI Identifier:
1575204
Report Number(s):
JLAB-THY-19-2996; DOE/OR/23177-4747; arXiv:1907.08551
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
11475186; 11621131001; AC05-06OR23177; FG02-03ER41260; CE110001104; DP151103101; DP180100497
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; 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

Salamu, Y., Ji, Chueng -Ryong, Melnitchouk, W., Thomas, A. W., Wang, P., and Wang, X. G. Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.094026.
Salamu, Y., Ji, Chueng -Ryong, Melnitchouk, W., Thomas, A. W., Wang, P., & Wang, X. G. Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries. United States. doi:10.1103/PhysRevD.100.094026.
Salamu, Y., Ji, Chueng -Ryong, Melnitchouk, W., Thomas, A. W., Wang, P., and Wang, X. G. Thu . "Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries". United States. doi:10.1103/PhysRevD.100.094026. https://www.osti.gov/servlets/purl/1575204.
@article{osti_1575204,
title = {Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries},
author = {Salamu, Y. and Ji, Chueng -Ryong and Melnitchouk, W. and Thomas, A. W. and Wang, P. and Wang, X. G.},
abstractNote = {Using recently derived results for one-loop hadronic splitting functions from a nonlocal implementation of chiral effective theory, we study the contributions from pseudoscalar meson loops to flavor asymmetries in the proton. Constraining the parameters of the regulating functions by inclusive production of $n$, $\Delta^{++}$, $\Lambda$ and $\Sigma^{*+}$ baryons in $pp$ collisions, we compute the shape of the light antiquark asymmetry $\bar{d}-\bar{u}$ in the proton and the strange asymmetry $s-\bar{s}$ in the nucleon sea. With these constraints, the magnitude of the $\bar{d}-\bar{u}$ asymmetry is found to be compatible with that extracted from the Fermilab E866 Drell-Yan measurement, with no indication of a sign change at large values of $x$, and an integrated value in the range $\langle \bar d-\bar u \rangle \approx 0.09-0.17$. The $s-\bar s$ asymmetry is predicted to be positive at $x > 0$, with compensating negative contributions at $x=0$, and an integrated $x$-weighted moment in the range $\langle x (s-\bar s) \rangle \approx (0.9-2.5) \times 10^{-3}$.},
doi = {10.1103/PhysRevD.100.094026},
journal = {Physical Review D},
number = 9,
volume = 100,
place = {United States},
year = {2019},
month = {11}
}

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