Inclusive semileptonic decays of polarized Λb Baryons into polarized τ-leptons
Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099, Mainz, Germany
2 Department of Physics, Technion-Israel Institute of Technology, 32000, Haifa, Israel
Published online: 27 February 2005
We employ OPE techniques within HQET to calculate the inclusive semileptonic decays of polarized Λb baryons. Lepton mass effects are included which enables us to also discuss rates into polarized τ-leptons. We present explicit results for the longitudinal polarization of the τ in the Λb rest frame as well as in the (τ−, vτ) c.m. frame. In both the Λb rest frame and in the (τ−, vτ) c.m. frame we make use of novel calculational techniques which considerably simplify the calculations. The transverse polarization components of the τ are calculated in the (τ−, vτ) c.m. frame. We delineate how to measure the full set of 14 polarized and unpolarized structure functions of the decay process by angular correlation measurements. A set of observables are identified that allow one to isolate the contributions of the twoO(1/m t 2) nonperturbative matrix elementsK b and εb.
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