Spin structure functions and intrinsic motion of the constituents

Details Spin structure functions and intrinsic motion of the constituents Spin structure functions and intrinsic motion of the constituents

2001-06-19

arxiv.org/abs/hep-ph/0106215v3

Phys.Rev.D65:054040,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, Tex. In this slightly modified version one more sum rule is added. The paper is accepted for publication in Phys. Re

Scientific paper

10.1103/PhysRevD.65.054040

The spin structure functions of the system of quasifree fermions on mass shell are studied in a consistently covariant approach. Comparison with the basic formulas following from the quark-parton model reveals the importance of the fermion motion inside the target for the correct evaluation of the spin structure functions. In particular it is shown, that regarding the moment $\Gamma_{1}$, both the approaches are equivalent for the static fermions, but differ by the factor 1/3 in the limit of massles fermions ($% m \ll p_0$, in target rest frame). Some other sum rules are discussed as well.

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