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

TL;DR

This paper predicts a new single spin asymmetry in photon-induced Drell-Yan processes, linking gluon poles to photon distribution amplitudes and nucleon polarization, advancing understanding of spin effects in QCD.

Contribution

It introduces a novel single spin asymmetry in Drell-Yan processes that probes gluon poles through photon distribution amplitudes and nucleon polarization.

Findings

Prediction of a new single spin asymmetry in Drell-Yan processes

Expression of asymmetry in terms of photon distribution amplitudes and nucleon functions

Insight into gluon poles and spin effects in QCD

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.