Abstract
A new technique, based on relative measurements of the longitudinal polarization (P) of positrons emitted in two opoosite directions with respect to the nuclear polarization (R=/), is used to provide constraints on extensions of the standard model (). The first result, i.e., R/=0.926±0.041, was obtained with . Interpreted in the framework of left-right symmetric models and assuming no mixing, it provides a 90% C.L. lower limit of 225 GeV/ for the mass of a possible right-handed charged W gauge boson, reducing the mass range allowed by other semileptonic experiments.
- Received 14 January 1993
DOI:https://doi.org/10.1103/PhysRevLett.70.4047
©1993 American Physical Society