Parton Distributions from W+- and Z Production in Polarized pp and pn Collisions at RHIC

Abstract

We study the production of $W^{\pm }$ and $Z$ gauge bosons in proton-proton and proton-neutron collisions up to a center-of-mass energy $\sqrt{s}=0.5TeV$, in connection with the realistic possibility of having proton-deuteron collisions at RHIC with a high luminosity. We stress the importance of measuring unpolarized cross sections for a better determination of the flavor asymmetry of the sea quarks. Since polarized proton beams will be available at RHIC, we evaluate several spin-dependent observables like, double helicity asymmetries $A_{LL}$ as a test of the sea quark polarization, double transverse spin asymmetries $A_{TT}$ as a practical way to determine a new structure function, the nucleon transversity distribution $h_1(x)$, and parity-violating asymmetries $A_L$ as a further test of our present knowledge of polarized parton distributions.

Comments: 16p,CPT-94/P.3000,TEX,19 fig available on cpt.univ-mrs.fr directory ftp/pub/preprints/94/fundamental-interactions/ 94-P.3000