Flavor asymmetry of sea quarks in the unquenched quark model

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.062202· OSTI ID:21499249

Santopinto, E; Bijker, R ^[1]

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1. Istituto Nazionale di Fisica Nucleare, Sezione di Genova, via Dodecaneso 33, I-16146 Italy (Italy)

The flavor asymmetry of the nucleon sea is studied in the framework of the unquenched quark model in which the effects of quark-antiquark pairs (uu-bar, dd-bar, and ss-bar) are taken into account via a microscopic, QCD-inspired, quark-antiquark creation mechanism. The inclusion of the qq-bar pairs leads to an excess of d-bar over u-bar, in agreement with the experimental data for the proton. In addition, the results for the flavor asymmetry of all ground-state octet and decuplet baryons are presented. The isospin symmetry leads to simple relations among the flavor asymmetries of octet and decuplet baryons. The flavor asymmetry of the {Sigma}{sup +} hyperon is predicted to be very similar to that of the proton and much larger than that for the {Xi}{sup 0} hyperon. A comparison with other approaches shows large differences in the predictions for the flavor asymmetries of the hyperons.

• OSTI ID: 21499249
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYONS
COMPARATIVE EVALUATIONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EVALUATION
FERMIONS
FIELD THEORIES
FLAVOR MODEL
FORECASTING
HADRONS
HYPERONS
INTERACTIONS
ISOSPIN
MATHEMATICAL MODELS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARK-ANTIQUARK INTERACTIONS
QUARKS
SIGMA BARYONS
SIGMA PARTICLES
SIGMA PLUS PARTICLES
STRANGE PARTICLES
SYMMETRY
XI BARYONS
XI NEUTRAL PARTICLES
XI PARTICLES