Left-right asymmetries in polarized [Formula Presented] scattering

We consider, in the electroweak standard model context, several left-right asymmetries in (Formula presented) elastic scattering at fixed target and collider experiments. For the former case, we show that the muon mass effects are important in a wide energy range. We also show that these asymmetries are sensitive to the electroweak mixing angle (Formula presented) The effect of an extra (Formula presented) neutral vector boson appearing in a 3-3-1 model is also considered. The capabilities of these asymmetries in the search of this extra (Formula presented) are addressed. © 1998 The American Physical Society.