Polarized Λ_b \to X_c τνin the SM and THDM

Abstract

The inclusive rate and $\tau$ spectrum for a polarized ${\Lambda }_b$ -baryon to decay to charm hadronic final states and leptons $\tau \nu$ in the SM and a two-Higgs doublet model are computed.The $O({\alpha }_s)$ QCD corrections to $\tau$ spectrum in the two-Higgs model are also given.

Revtex,11 pages,5 figures