Axial exchange currents and nucleon spin

Details Axial exchange currents and nucleon spin Axial exchange currents and nucleon spin

2006-11-18

arxiv.org/abs/hep-ph/0611248v1

Eur.Phys.J.A27:365-372,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure

Scientific paper

10.1140/epja/i2005-10270-4

We calculate the hypercharge and flavor singlet axial couplings related to the spin of the nucleon in a constituent quark model. In addition to the standard one-body axial currents, the model includes two-body axial exchange currents. The latter are necessary to satisfy the Partial Conservation of Axial Current (PCAC) condition. For both axial couplings we find significant corrections to the standard quark model prediction. Exchange currents reduce the valence quark contribution to the nucleon spin and afford an interpretation of the missing nucleon spin as orbital angular momentum carried by nonvalence quark degrees of freedom.

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