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

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dc.creatorKoike, Yuji
dc.creatorTanaka, Kazuhiro
dc.creatorYoshida, Shinsuke
dc.date2008-05-15
dc.date2008-09-05
dc.date.accessioned2026-07-07T11:50:48Z
dc.date.available2026-07-07T11:50:48Z
dc.descriptionThe 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.
dc.description12 pages, 4 figures, minor modifications, typos corrected; version to appear in PLB
dc.identifierhttps://arxiv.org/abs/0805.2289
dc.identifierhttp://arxiv.org/abs/0805.2289
dc.identifierPhys.Lett.B668:286-292,2008
dc.identifierdoi:10.1016/j.physletb.2008.08.049
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203682
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDrell-Yan double-spin asymmetry A_{LT} in polarized p\bar{p} collisions: Wandzura-Wilczek contribution
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