Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-11-18
AIP Conf.Proc.915:642-645,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at the 17 th International Spin Physics Symposium Kyoto, Japan Oct 2-7 '06
Scientific paper
10.1063/1.2750862
We propose an ultimate upgrade of the Karl- Sehgal (KS) formula which relates baryon magnetic moments to the spin structure of constituent quarks, by adding anomalous magnetic moments of quarks. We first argue that relativistic nature of quarks inside baryons requires introduction of two kinds of magnetisms, one axial and the other tensoriel. The first one is associated with integrated quark helicity distributions(standard) and the second with integrated transversity distributions . The weight of each contribution is controlled by the combination of two parameters, the ratio of the quark mass to the average kinetic energy and the quark anomalous magnetic moment. The quark anomalous magnetic moment is shown to be correlated to transversity and both parameters are necessary ingredients in describing relativistic quarks. The proposed formula, when confronted with baryon magnetic moments data with reasonable inputs, confirms that anomalous magnetic moments of quarks are unavoidable intrinsic properties .
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