Article ID Journal Published Year Pages File Type
10723872 Physics Letters B 2011 6 Pages PDF
Abstract
We study parity-even and parity-odd polarization observables for the process pp→l±X, where the lepton comes from the decay of a W-boson. By using the collinear twist-3 factorization approach, we consider the case when one proton is transversely polarized, while the other is either unpolarized or longitudinally polarized. These observables give access to two particular quark-gluon-quark correlation functions, which have a direct relation to transverse momentum dependent parton distributions. We present numerical estimates for RHIC kinematics. Measuring, for instance, the parity-even transverse single spin correlation would provide a crucial test of our current understanding of single spin asymmetries in the framework of QCD.
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Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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