Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-12-22
Phys.Rev.C80:065210,2009
Physics
Nuclear Physics
Nuclear Theory
10 pages, 3 figures, 4 tables, Physical Review C, in press
Scientific paper
10.1103/PhysRevC.80.065210
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.
Bijker Roelof
Santopinto Elena
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