The spin dependent structure functions of the nucleon

Details The spin dependent structure functions of the nucleon The spin dependent structure functions of the nucleon

2005-12-22

arxiv.org/abs/hep-ph/0512286v2

Phys.Rev.D73:094008,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

48 pages, 14 figures. New figure added and some previous figures amended. New references added and some amendments and additio

Scientific paper

10.1103/PhysRevD.73.094008

We calculate the spin dependent structure functions g_{1}(x) and g_{2}(x) of the proton and neutron. Our calculation uses the meson cloud model of nucleon structure, which has previously given a good description of the HERMES data on polarized sea quark distributions, and includes all the leading contributions to spin dependent effects in this model. We find good agreement between our calculations and the current experimental data for the structure functions. We include in our calculations kinematic terms, which mix transverse and longitudinal spin components, for hadrons of spin 1/2, 1 and 3/2, and which can give considerable contributions to the g_{2} structure functions. We also consider the possible interference terms between baryons or mesons in different final states with the same quantum numbers, and show that most of these terms do not give leading contributions to the spin dependent structure functions.

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