Unquenched quark model for baryons: Magnetic moments, spins, and orbital angular momenta

2009/12/22 by R. Bijker, E. Santopinto · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.80.065210

published as Phys.Rev.C80:065210,2009 · 10 pages, 3 figures, 4 tables, Physical Review C, in press

arxiv created 2009/12/22 · openalex publication_date 2009/12/31 · arxiv updated 2010/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present an unquenched quark model for baryons in which the effects of the quark-antiquark pairs (uu, dd, and ss) are taken into account in an explicit form via a microscopic, QCD-inspired, quark-antiquark creation mechanism. In the present approach, the contribution of the quark-antiquark pairs can be studied for any inital baryon and for any flavor of the qq pairs. It is shown that, while the inclusion of the qq pairs does not affect the baryon magnetic moments, it leads to a sizable contribution of the orbital angular momentum to the spin of the proton and the \ensuremathΛ hyperon.

Citations

• Review of Particle Physics
• Timelike and spacelike nucleon electromagnetic form factors beyond relativistic constituent quark models
• Spectroscopy of tetraquark states
• Evidence for the absence of gluon orbital angular momentum in the nucleon
• SU(3)symmetry breaking in hyperon semileptonic decays
• Instantons in QCD
• Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs
• Longitudinal double-spin asymmetry and cross section for inclusive jet production in polarized proton collisions at sqrt(s) = 200 GeV
• Algebraic Models of Hadron Structure II. Strange Baryons

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• Valence and sea quarks in the nucleon