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

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.

preprint2015arXivOpen access
V. BaroneM. BoglioneJ. O. Gonzalez HernandezS. Melis
hep-ph
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V. BaroneM. BoglioneJ. O. Gonzalez HernandezS. Melis

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