Comparative analysis of the transversities and the longitudinally polarized distribution functions of the nucleon

Abstract

A first empirical extraction of the transversity distributions for the $u$- and $d$-quarks has been done by Anselmino {\it et al.} based on the combined global analysis of the measured azimuthal asymmetries in semi-inclusive deep inelastic scatterings and those in $e^{+}{e}^{-}\to h_1{h}_{2}X$ processes. Although with large uncertainties, the determined transversity distributions already appear to reveal a remarkable qualitative difference with the corresponding longitudinally polarized distributions. We point out that this difference contains very important information on internal spin structure of the nucleon.

12 pages, 2 figures

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• Collinear parton distributions and the structure of the nucleon sea in a light-front meson-cloud model
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• Transverse Spin Effects in Future Drell-Yan Experiments
• Single/Double-Spin Asymmetry Measurements of Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target through Deep Inelastic Scattering