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

2009; American Institute of Physics; Volume: 80; Issue: 6 Linguagem: Inglês

10.1103/physrevc.80.065210

1538-4497

R. Bijker, E. Santopinto,

Particle physics theoretical and experimental studies

We present an unquenched quark model for baryons in which the effects of the quark-antiquark pairs (up, down and strange) 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 pairs. It is shown that, while the inclusion of quark-antiquark pairs does not affect the baryon magnetic moments, it leads to a sizeable contribution of the orbital angular momentum to the spin of the proton and the Lambda hyperon.