Abstract
We recall the definitions and the basic properties of the transversity distributions h 1 q ( x, Q 2) and the corresponding nucleon tensor charges δq( Q 2). We briefly comment on different estimates from several phenomenological models and on the future possible measurements with the polarized pp collider at RHIC-BNL. Recent works on the Q 2-evolution of h 1 q ( x, Q 2) and a positivity bound are also discussed.
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