Unified Picture for Single Transverse-Spin Asymmetries in Hard-Scattering Processes
Unified Picture for Single Transverse-Spin Asymmetries in Hard-Scattering Processes
Using lepton-pair production in hadron-hadron collisions as an example, we explore the relation between two well-known mechanisms for single-transverse-spin asymmetries in hard processes: twist-three quark-gluon correlations when the pair's transverse momentum is large, q perpendicular >> Lambda QCD, and time-reversal-odd and transverse-momentum-dependent parton distributions when q perpendicular is much less …