Test of a model of right-handedb-quark decays

Gronau and Wakaizumi have proposed a model in which the dominant $b$ decays are due to exchange of a new right-handed gauge boson. A test of this model via the study of polarized ${\Lambda }_b$ baryons produced in $e^{+}{e}^{-}\to Z\to {\Lambda }_b+X$ is suggested.