Table of Contents
Fetching ...
Paper

Measurement of the parity-violating longitudinal single-spin asymmetry for $W^{\pm}$ boson production in polarized proton-proton collisions at $\sqrt{s} = 500 $GeV

Abstract

We report the first measurement of the parity violating single-spin asymmetries for midrapidity decay positrons and electrons from and boson production in longitudinally polarized proton-proton collisions at GeV by the STAR experiment at RHIC. The measured asymmetries, and , are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized DIS measurements.