Parton distribution functions and quark orbital motion

Details Parton distribution functions and quark orbital motion Parton distribution functions and quark orbital motion

2007-06-20

arxiv.org/abs/0706.2988v1

Eur.Phys.J.C52:121-131,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 2 figures, 1 table. Paper is accepted for publication in Eur.Phys.J. C

Scientific paper

10.1140/epjc/s10052-007-0360-1

Covariant version of the quark-parton model is studied. Dependence of the structure functions and parton distributions on the 3D quark intrinsic motion is discussed. The important role of the quark orbital momentum, which is a particular case of intrinsic motion, appears as a direct consequence of the covariant description. Effect of orbital motion is substantial especially for polarized structure functions. At the same time, the procedure for obtaining the quark momentum distributions of polarized quarks from the combination of polarized and unpolarized structure functions is suggested.

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