Understanding the proton spin "puzzle" with a new "minimal" quark model

Details Understanding the proton spin "puzzle" with a new "minimal" quark model Understanding the proton spin "puzzle" with a new "minimal" quark model

2002-09-11

arxiv.org/abs/hep-ph/0209115v2

Eur.Phys.J. A12 (2001) 353-359

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 latex pages, Published in Eur.Phys.J.A

Scientific paper

10.1007/s100500170014

We investigate the spin structure of the nucleon in an extended Jaffe-Lipkin quark model. In addition to the conventional $3q$ structure, different $(3q)(Q\bar{Q})$ admixtures in the nucleon wavefunction are also taken into account. The contributions to the nucleon spin from various components of the nucleon wavefunction are discussed. The effect due to the Melosh-Wigner rotation is also studied. It is shown that the Jaffe-Lipkin term is only important when antiquarks are negatively polarized. We arrive at a new "minimal" quark model, which is close to the naive quark model, in order to understand the proton spin "puzzle".

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