Recent developments in the constituent quark model including quark-antiquark pairs

Details Recent developments in the constituent quark model including quark-antiquark pairs Recent developments in the constituent quark model including quark-antiquark pairs

2008-09-12

arxiv.org/abs/0809.2296v1

Proceedings of the 11th Workshop on the Physics of Excited Nucleons, NSTAR 2007, Springer (2008), 35-39

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures, 2 tables, NSTAR2007, Proceedings of the 11th Workshop on the Physics of Excited Nucleons, Springer, 2008

Scientific paper

We present the formalism for a new generation of unquenched quark models for baryons in which the effects of quark-antiquark pairs (u anti-u, d anti-d and s anti-s) are taken into account in an explicit form via a microscopic, QCD-inspired, quark-antiquark creation mechaniscm. The present approach is an extension of the flux-tube breaking model of Geiger and Isgur in which now the contributions of quark-antiquark pairs an be studied for any initial baryon and for any flavor of the q anti-q pair. It is shown that the inclusion of q anti-q paris leads to a large contribution of orbital angular momentum to the proton spin.

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