Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum
Single transverse-spin asymmetry in Drell-Yan production at large and moderate transverse momentum
We study the single-transverse-spin asymmetry for the Drell-Yan process. We consider production of the lepton pair at large transverse momentum, ${q}_{\ensuremath{\perp}}\ensuremath{\sim}Q$, where $Q$ is the pair's mass. The spin asymmetry is then of higher twist and may be generated by twist-three quark-gluon correlation functions. Expanding the result for ${q}_{\ensuremath{\perp}}\ensuremath{\ll}Q$, we …