A Unified Picture for Single Transverse-Spin Asymmetries in Hard Processes

Details A Unified Picture for Single Transverse-Spin Asymmetries in Hard Processes A Unified Picture for Single Transverse-Spin Asymmetries in Hard Processes

2006-02-28

arxiv.org/abs/hep-ph/0602239v1

Phys.Rev.Lett.97:082002,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.97.082002

Using Drell-Yan pair production 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, $q_\perp \gg \Lambda_{\rm QCD}$, and time-reversal-odd and transverse-momentum-dependent parton distributions when $q_\perp$ is much less than the pair's mass. We find that although the two mechanisms have their own domain of validity, they describe the same physics in the kinematic region where they overlap. This unifies the two mechanisms and imposes an important constraint on phenomenological studies of single spin asymmetries.

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