Drell-Yan double-spin asymmetry A_{LT} in polarized p\bar{p} collisions: Wandzura-Wilczek contribution

Abstract

The longitudinal-transverse spin asymmetry A_{LT} in the polarized Drell-Yan process depends on the twist-3 spin-dependent distributions of nucleon. In addition to the contributions expressed as matrix element of the twist-3 operators, these distributions contain the so-called Wandzura-Wilczek part, which is completely determined by a certain integral of the twist-2 spin-dependent parton distributions. We demonstrate that the recently obtained empirical information on the transversity distribution allows a realistic estimate of the Wandzura-Wilczek contribution to A_{LT} for the case of polarized proton-antiproton collisions. In particular, our results in the Wandzura-Wilczek approximation indicate that rather large A_{LT} can be observed in the proposed spin experiments at GSI, and its behavior as a function of dilepton mass obeys novel pattern, compared with the other double-spin asymmetries A_{TT} and A_{LL}. Our results provide a guide for testing a signal of effects originating from the twist-3 operators associated with quark-gluon correlation.

arXiv comment12 pages, 4 figures, minor modifications, typos corrected; version to appear in PLB

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Cited by in corpus (20)

• Fragmentation contribution to the transverse single-spin asymmetry in proton-proton collisions
• Operator Constraints for Twist-3 Functions and Lorentz Invariance Properties of Twist-3 Observables
• Semi-Inclusive Deep Inelastic Scattering in Wandzura-Wilczek-type approximation
• Lorentz invariance relations between parton distributions and the Wandzura-Wilczek approximation
• The role of zero-mode contributions in the matching for the twist-3 PDFs $e(x)$ and $h_L(x)$
• Twist-three relations of gluonic correlators for the transversely polarized nucleon
• Parton distribution functions beyond leading twist from lattice QCD: The $h_L(x)$ case
• Longitudinal-transverse double-spin asymmetries in single-inclusive leptoproduction of hadrons
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• Lorentz invariance relations and Wandzura-Wilczek approximation
• Twist-3 Double Spin Asymmetries in Drell-Yan Processes
• Double Transverse-Spin Asymmetries for Drell-Yan Process in pp and p\bar{p} Collisions: Role of Nonleading QCD Corrections at Small Transverse Momentum