Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-09
Phys.Rev. D67 (2003) 014019
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, Tex, 2 figures (eps format). Minor language corrections are done in the revised version. Accepted for publication in
Scientific paper
10.1103/PhysRevD.67.014019
The spin structure of the system of quasifree fermions having total angular momentum $J=1/2$ is studied in a consistently covariant approach. Within this model the relations between the spin functions are obtained. Their particular cases are the sum rules Wanzura - Wilczek, Efremov - Leader - Teryaev, Burkhardt - Cottingham and also the expression for the Wanzura - Wilczek twist 2 term $g_{2}^{WW}$. With the use of the proton valence quark distributions as an input, the corresponding spin functions are obtained. The resulting structure functions $g_{1}$ and $g_{2}$ are well compatible with the experimental data.
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