Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction

Details Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction

1997-09-15

arxiv.org/abs/hep-ph/9709342v2

Eur.Phys.J.C5:681-685,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX, 6 PS figures, final version, to appear in EPJC

Scientific paper

10.1007/s100520050309

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 $< \cos\phi >$ and $< \cos2\phi >$ are significant. We also reconsider the results of perturbative effects for $< \cos\phi >$ 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 $< \cos\phi >$. In the same approach we calculate the $< \cos2\phi >$ as well.

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