On the cos 2 phi asymmetry in unpolarized leptoproduction

Details On the cos 2 phi asymmetry in unpolarized leptoproduction On the cos 2 phi asymmetry in unpolarized leptoproduction

2005-12-12

arxiv.org/abs/hep-ph/0512145v1

Phys.Lett.B632:277-281,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 7 figures

Scientific paper

10.1016/j.physletb.2005.10.016

We investigate the origin of the cos 2 phi azimuthal asymmetry in unpolarized semiinclusive DIS. The contributions to this asymmetry arising from the intrinsic transverse motion of quarks are explicitly evaluated, and predictions for the HERMES and COMPASS kinematic regimes are presented. We show that the effect of the leading-twist Boer-Mulders function h_1^perp(x, k_T^2), which describes a correlation between the transverse momentum and the transverse spin of quarks, is quite significant and may also account for a part of the cos 2 phi asymmetry measured by ZEUS in the perturbative domain.

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