Eur. Phys. J. A (2010) 45: 373-388
https://doi.org/10.1140/epja/i2010-11016-y

Regular Article - Theoretical Physics

Weighted azimuthal asymmetries in a diquark spectator model

¹ Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, I-27100, Pavia, Italy
² Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, I-27100, Pavia, Italy

^* e-mail: marco.radici@pv.infn.it

Received: 19 March 2010
Revised: 8 June 2010
Accepted: 18 July 2010
Published online: 5 August 2010

Abstract

We analytically calculate weighted azimuthal asymmetries in semi-inclusive lepton-nucleon deep-inelastic scattering and Drell-Yan processes, using transverse-momentum-dependent partonic densities obtained in a diquark spectator model. We compare the asymmetries with available preliminary experimental data, in particular for the Collins and the Sivers effect. We make predictions for other cases of interest in running and planned experiments.