Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-11
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".
Ma Bo-Qiang
Schmidt Ivan
Yang Jian-Jun
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