Double-Spin Asymmetry ALT for Polarized Drell-Yan Process in pp̄ Collisions: Wandzura-Wilczek Contribution
نویسندگان
چکیده
The longitudinal-transverse spin asymmetry ALT in the polarized Drell-Yan process depends on twist-3 quark distributions of nucleon. In addition to the contributions associated with the twist-3 operators, these distributions contain the “Wandzura-Wilczek (WW)” part, which is determined by a certain integral of twist-2 distributions. The recently obtained empirical information on the transversity allows a realistic estimate of the WW contribution to ALT for the polarized pp̄ collisions. Our results indicate that rather large ALT (∼ 10%) can be observed in the proposed spin experiments at GSI, with novel pattern as a function of dilepton mass compared with AT T and ALL.
منابع مشابه
Drell-Yan double-spin asymmetry ALT in polarized pp̄ collisions: Wandzura-Wilczek contribution
The longitudinal-transverse spin asymmetry ALT 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 distribut...
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