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Title: Flavor symmetry breaking in the Δ sea

Abstract

The finding of a sizeable asymmetry in the $$\bar u$$ and $$\bar d$$ distributions in the proton was one of the more consequential experimental findings in hadron physics last century. Although widely believed to be related to the fundamental role of chiral symmetry in QCD, a definitive verification of this hypothesis has remained elusive. We introduce a novel test of the role of chiral symmetry in generating the sea flavor asymmetry by comparing the $$\bar d-\bar u$$ content in the proton with that in the $$\Delta^+$$ baryon, where a significant enhancement is expected around the opening of the $$N \pi$$ decay channel. Recent developments in lattice QCD suggest a promising way to test this prediction in the near future.

Authors:
 [1]; ORCiD logo [2];  [3];  [4]
  1. Vrije Univ., Amsterdam (Netherlands)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Univ. of Bonn (Germany)
  4. Univ. of Adelaide, SA (Australia)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE; Netherlands Organization for Scientific Research (NWO); German Research Foundation (DFG)
OSTI Identifier:
1556840
Alternate Identifier(s):
OSTI ID: 1557625
Report Number(s):
JLAB-THY-18-2806; DOE/OR/-23177-4542; arXiv:1809.06885
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
CE110001104; DP150103164; AC05-06OR23177; 392578569
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ethier, J. J., Melnitchouk, W., Steffens, Fernanda, and Thomas, A. W. Flavor symmetry breaking in the Δ sea. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.034014.
Ethier, J. J., Melnitchouk, W., Steffens, Fernanda, & Thomas, A. W. Flavor symmetry breaking in the Δ sea. United States. doi:10.1103/PhysRevD.100.034014.
Ethier, J. J., Melnitchouk, W., Steffens, Fernanda, and Thomas, A. W. Mon . "Flavor symmetry breaking in the Δ sea". United States. doi:10.1103/PhysRevD.100.034014.
@article{osti_1556840,
title = {Flavor symmetry breaking in the Δ sea},
author = {Ethier, J. J. and Melnitchouk, W. and Steffens, Fernanda and Thomas, A. W.},
abstractNote = {The finding of a sizeable asymmetry in the $\bar u$ and $\bar d$ distributions in the proton was one of the more consequential experimental findings in hadron physics last century. Although widely believed to be related to the fundamental role of chiral symmetry in QCD, a definitive verification of this hypothesis has remained elusive. We introduce a novel test of the role of chiral symmetry in generating the sea flavor asymmetry by comparing the $\bar d-\bar u$ content in the proton with that in the $\Delta^+$ baryon, where a significant enhancement is expected around the opening of the $N \pi$ decay channel. Recent developments in lattice QCD suggest a promising way to test this prediction in the near future.},
doi = {10.1103/PhysRevD.100.034014},
journal = {Physical Review D},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.034014

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