Gluon poles and photon distribution amplitudes in Drell-Yan-like processes

Abstract

We calculate the hadron tensor related to the photon-induced Drell-Yan process, with incoming nucleon being transversally polarised. We predict the new single spin asymmetry which probes gluon poles and which is expressed in terms of photon (both chiral-odd and chiral-even) distribution amplitudes and chiral-odd nucleon function stemming from the nucleon transverse polarization.

Comments: 6 pages, 3 figures; Appendix has been added