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

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

doi:10.1103/PhysRevD.100.094026

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

Journal Article · Thu Nov 21 00:00:00 EST 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.100.094026· OSTI ID:1607573

;

; Wang, X. G.

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 $$\langle x (s-\bar s) \rangle \approx (0.9-2.5) \times 10^{-3}$$.

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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; 11475186; 11621131001; CE110001104; DP151103101; DP180100497

OSTI ID:: 1607573

Alternate ID(s):: OSTI ID: 1575204

Report Number(s):: JLAB-THY-19-2996; DOE/OR/23177-4747; arXiv:1907.08551; PRVDAQ; 094026

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 100 Journal Issue: 9; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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