Transversity distributions and Drell-Yan spin asymmetries

Details Transversity distributions and Drell-Yan spin asymmetries Transversity distributions and Drell-Yan spin asymmetries

1999-05-31

arxiv.org/abs/hep-ph/9905559v1

Nucl.Phys.Proc.Suppl. 79 (1999) 620

Physics

High Energy Physics

High Energy Physics - Phenomenology

1+3 pages, LATEX with npb.sty, 2 eps figures. Talk given at the 7th International Workshop on Deep Inelastic Scattering and QC

Scientific paper

10.1016/S0920-5632(99)00801-4

We discuss transversity distributions and Drell-Yan transverse double spin asymmetries. First, the antiquark flavor asymmetry $\Delta_{_T} \bar u/\Delta_{_T} \bar d$ is discussed by using two different descriptions, a meson-cloud model and a Pauli exclusion model. We find that both calculations produce a significant $\Delta_{_T} \bar d$ excess over $\Delta_{_T} \bar u$. Next, we study its effects on the transverse spin asymmetry $A_{_{TT}}$ and on the Drell-Yan proton-deuteron asymmetry $\Delta_{_T}\sigma^{pd}/2 \Delta_{_T}\sigma^{pp}$. We find that the ratio $\Delta_{_T}\sigma^{pd}/2 \Delta_{_T}\sigma^{pp}$ is very useful for investigating the flavor asymmetry effect.

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