Q2DEPENDENCE OF AZIMUTHAL ASYMMETRIES IN SEMIINCLUSIVE DEEP INELASTIC SCATTERING AND IN DRELL–YAN

Abstract

We study several azimuthal asymmetries in semiinclusive deep inelastic scattering and in Drell–Yan, interpreting them within the formalism of the quark correlator, with a particular reference to T-odd functions. The correlator contains an undetermined energy scale, which we fix on the basis of a simple and rather general argument. We find a different value than the one assumed in previous treatments of T-odd functions. This implies different predictions on the Q2dependence of the above mentioned asymmetries. Our theoretical result on unpolarized Drell–Yan is compared with available data. Predictions on other azimuthal asymmetries could be tested against yields of planned experiments of Drell–Yan and semiinclusive deep inelastic scattering.