Phenomenological analysis of azimuthal asymmetries in unpolarized semi-inclusive deep inelastic scattering

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 14 Apr 2015Embargo end date: 01 Jan 2015 Italy English Publisher:American Physical Society (APS)Journal:Physical Review D, volume 91 (issn: 1550-7998, eissn: 1550-2368,

Copyright policy )Funded by:EC | HADRONPHYSICS3, FCT | D4

Authors: V. Barone; BOGLIONE, MARIAELENA; GONZALEZ HERNANDEZ, Jose Osvaldo; MELIS, stefano;

doi: 10.1103/physrevd.91.074019 , 10.48550/arxiv.1502.04214

arXiv: 1502.04214

handle: 11584/90191 , 2318/1509286 , 11579/72067

Phenomenological analysis of azimuthal asymmetries in unpolarized semi-inclusive deep inelastic scattering

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Abstract

We present a phenomenological analysis of the cos-phi and cos-2phi asymmetries in unpolarized semi-inclusive deep inelastic scattering, based on the recent multidimensional data released by the COMPASS and HERMES Collaborations. In the TMD framework, valid at relatively low transverse momenta, these asymmetries arise from intrinsic transverse momentum and transverse spin effects, and from their correlations. The role of the Cahn and Boer-Mulders effects in both azimuthal moments is explored up to order 1/Q. As the kinematics of the present experiments is dominated by the low-Q^2 region, higher-twist contributions turn out to be important, affecting the results of our fits.

18 pages, 5 figures, one paragraph added at the end of Section IV, one reference added. PRD version

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Italy

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Keywords

Nuclear and High Energy Physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, 530

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