Updated Collider Bounds on the Parameters of Dynamical Torsion

Abstract

We constrain the parameters of dynamical torsion, namely, the torsion-fermion coupling and the torsion mass, by making a careful analysis of current LEP-2 data at several energies, as well as CDF and D0 data from Run-I of the Tevatron. We find that measurements of the forward-backward asymmetry in the e+- e- -> mu+- mu- channel at LEP-2 produce the most restrictive bounds over most of the parameter space,though other measurements, too, have a significant role to play. Our results considerably improve the existing constraints on models with dynamical torsion.