Abstract

We discuss transversity distributions and Drell-Yan transverse double spin asymmetries. First, the antiquark flavor asymmetry Δ T u Δ T 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 Δ T d excess over Δ T u . Next, we study its effects on the transverse spin asymmetry A TT and on the Drell-Yan proton-deuteron asymmetry Δ Tσ pd 2Δ Tσ pp . We find that the ratio Δ Tσ pd 2Δ Tσ pp is very useful for investigating the flavor asymmetry effect.

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