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Quark orbital angular momentum in the baryon. (English) Zbl 1023.81514

Summary: Analytical and numerical results, for the orbital and spin content carried by different quark flavors in the baryons, are given in the chiral quark model with symmetry breaking. The reduction of the quark spin, due to the spin dilution in the chiral splitting processes, is transferred into the orbital motion of quarks and antiquarks. The orbital angular momentum for each quark flavor in the proton as a function of the partition factor \(\kappa\) and the chiral splitting probability a is shown. The cancellation between the spin and orbital contributions in the spin sum rule and in the baryon magnetic moments is discussed.

MSC:

81V35 Nuclear physics
81R40 Symmetry breaking in quantum theory
81V05 Strong interaction, including quantum chromodynamics
81-04 Software, source code, etc. for problems pertaining to quantum theory
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