Tau Polarization Asymmetry in $B\to X_s\ddot{I}{„}^{+}\ddot{I}{„}^{-}$

Abstract

Rare $B$ decays provide an opportunity to probe for new physics beyond the Standard Model. In this paper, we propose to measure the tau polarization in the inclusive decay $B\to X_s\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ and discuss how it can be used, in conjunction with other observables, to completely determine the parameters of the flavor-changing low-energy effective Hamiltonian. Both the Standard Model and several new physics scenarios are examined. This process has a large enough branching fraction, $\sim \mathrm{few}\times 10^{-7}$, such that sufficient statistics will be provided by the B-Factories currently under construction.

11 pages, LaTex file with psfig. Figures included via uufiles. Lengthened version. Includes new calculation of Monte Carlo fit to Wilson coefficients