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arXiv · hep-ph/9709342

Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction

K. A. Oganessyan·H. R. Avakian·N. Bianchi·P. Di Nezza
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Abstract

We consider the azimuthal asymmetries in semi-inclusive deep inelastic leptoproduction arising due to both perturbative and nonperturbative effects at HERMES energies and show that the $k_T^2/Q^2$ order corrections to $< \cosϕ>$ and $< \cos2ϕ>$ are significant. We also reconsider the results of perturbative effects for $< \cosϕ>$ at large momentum transfers \cite{A1} using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to $18{%}$ difference in $< \cosϕ>$. In the same approach we calculate the $< \cos2ϕ>$ as well.

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K. A. Oganessyan, H. R. Avakian, N. Bianchi, P. Di Nezza. 1998-03-03. Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction. https://doi.org/10.1007/s100520050309

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