2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39295We discuss the Drell-Yan proton-deuteron (p-d) asymmetry R_{pd}, which is defined by the proton-proton and proton-deuteron cross-section ratio Δ_{(T)}σ^{pd}/2Δ_{(T)}σ^{pp}, and its relation to the polarized light-antiquark flavor asymmetry. Using a formalism of the polarized {\it pd} Drell-Yan process, we show that the R_{pd} especially in the large-x_F region is very useful for finding the flavor asymmetry in the longitudinally-polarized and transversity distributions. Our results are particularly important to study the flavor asymmetry in the transversity distributions because they cannot be measured by inclusive deep inelastic scattering and W-production process.1+8 pages, LATEX, ptptex.sty, ptp-text.sty, epsf.sty, 4 eps figures. Talk given at the Circum-Pan-Pacific RIKEN Symposium on "High Energy Spin Physics", RIKEN, Wako, Japan, Nov. 3-6, 1999, to be published in proceedings. Complete postscript file including the figures is available at http://www-hs.phys.saga-u.ac.jp . Email: miyama@cc.saga-u.ac.jpHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentNuclear Theorytext