Transversity distributions and spin asymmetries
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We discuss transversity distributions and transverse spin asymmetries. First, $Q^2$ evolution results are shown for transversity and longitudinally polarized distributions. Second, the antiquark flavor asymmetry $Δ_{_T} \bar u/Δ_{_T} \bar d$ is discussed in two different descriptions, a meson-cloud model and an exclusion model. Both calculations produce a significant $Δ_T \bar d$ excess over $Δ_{_T} \bar u$. Third, we explain general formalism of the polarized proton-deuteron Drell-Yan processes. This study is partly intended to find the asymmetry $Δ_{_T} \bar u/Δ_{_T} \bar d$ by the p-d asymmetry. However, the existence of tensor structure in the deuteron produces a number of new structure functions. There exist 108 structure functions and 22 ones even after integrating the cross section over the virtual-photon transverse momentum $\vec Q_T$.
1+3 pages, LATEX with amsmath.sty, epsfig.sty, wrapfig.sty, and sprocl.sty, 2 eps figures. Talk given at the 13th International Symposium on High Energy Spin Physics. Protvino, Russia, Sept. 8 -- 12, 1998, to be published in proceedings by the World Scientific. Complete postscript file including the figures is also available at http://www2.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html Email: 97sm16@edu.cc.saga-u.ac.jp, 98td25@edu.cc.saga-u.ac.jp, kumanos@cc.saga-u.ac.jp, 96td25@edu.cc.saga-u.ac.jp
1+3 pages, LATEX with amsmath.sty, epsfig.sty, wrapfig.sty, and sprocl.sty, 2 eps figures. Talk given at the 13th International Symposium on High Energy Spin Physics. Protvino, Russia, Sept. 8 -- 12, 1998, to be published in proceedings by the World Scientific. Complete postscript file including the figures is also available at http://www2.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html Email: 97sm16@edu.cc.saga-u.ac.jp, 98td25@edu.cc.saga-u.ac.jp, kumanos@cc.saga-u.ac.jp, 96td25@edu.cc.saga-u.ac.jp