Seminar organised by EDF
Subject : Asymmetries associated with higher twists: Gauge invariance of polarized Drell-Yan, gluonic poles and twist three
Speaker: Dr. I. V. Anikin, Univ. Regensburg, Germany
We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. The special role is played by the contour gauge for gluon fields. The prescription for the gluonic pole in the twist 3 correlator is related to causality property and compared with the prescriptions for exclusive hard processes. As a result we get the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is accordingly enhanced by a factor of two.
When and where: Thursday, March 29, 2012 at 16.00 h in room U.203, Campus Groenenborger