The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 5 Issue 4 (1998) pp 681-685
DOI 10.1007/s100529800873

theoretical physics:
Investigations of azimuthal asymmetry in semi-inclusive leptoproduction

K.A. Oganessyan (a), H.R. Avakian (b), N. Bianchi, P. Di Nezza

LNF-INFN, C.P. 13, Enrico Fermi 40, Frascati, Italy (e-mail: kogan@lnf.infn.it, avakian@lnf.infn.it, bianchi@lnf.infn.it, dinezza@lnf.infn.it)

Received: 24 October 1997 / Revised version: 10 February 1998 / Published online: 30 March 1998

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 $\langle \cos\phi \rangle$ and $\langle \cos2\phi \rangle$ are significant. We also reconsider the results of perturbative effects for $\langle \cos\phi \rangle$ at large momentum transfers [1] using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to 18% difference in $\langle \cos\phi \rangle$. In the same approach we calculate the $\langle \cos2\phi \rangle$ as well.

(a) On leave of absence from Yerevan Physics Institute, Alikhanian Br.2, 375036 Yerevan, Armenia
(b) On leave of absence from Yerevan Physics Institute, Alikhanian Br.2, 375036 Yerevan, Armenia

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Online publication: October 19, 1998
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