Drell-Yan proton-deuteron asymmetry and polarized light-antiquark distributions

2000/01/11 by M. Miyama
Physics and Astronomy · #hep-ph #hep-ex #nucl-th

paper · pdf

published as RIKEN Rev. 28 (2000) 50-54 · 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: [email protected]

Abstract

We 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.

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