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

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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Cited by in corpus (7)

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• Where do we stand with a 3-D picture of the proton?
• First measurement of unpolarized SIDIS cross section and cross section ratios from a ${}^3$He target
• SIDIS-RC EvGen: a Monte-Carlo event generator of semi-inclusive deep inelastic scattering with the lowest-order QED radiative corrections
• Mapping the internal structure of hadrons through color and spin effects
• Measurement of the azimuthal modulations of hadrons in unpolarised SIDIS
• Soft background fields at next-to-leading power in transverse momentum dependent SIDIS with jets