On the cos 2 phi asymmetry in unpolarized leptoproduction

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dc.creatorBarone, Vincenzo
dc.creatorLu, Zhun
dc.creatorMa, Bo-Qiang
dc.date2005-12-12
dc.date.accessioned2026-07-07T10:44:30Z
dc.date.available2026-07-07T10:44:30Z
dc.descriptionWe 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.
dc.description11 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0512145
dc.identifierhttp://arxiv.org/abs/hep-ph/0512145
dc.identifierPhys.Lett.B632:277-281,2006
dc.identifierdoi:10.1016/j.physletb.2005.10.016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182614
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOn the cos 2 phi asymmetry in unpolarized leptoproduction
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