Speaker
Description
Semileptonic decays of B-mesons into excited charmed mesons of the 1P quadruplet are investigated in the context of the Standard Model and the type II two-Higgs doublet model. Predictions for differential branching fractions as a function of the four-momentum transfer squared are presented for the charmed meson either being a D2, D1, D1' or D0-meson, as well as predictions for the ratios of the semi-tauonic and light lepton semileptonic branching fractions. These predictions rely on the determination of the leading Isgur-Wise function from the measured total branching fraction of the narrow 1P states and hadronic branching fractions which are connected through a factorization theorem to the semileptonic form factors at maximal recoil of the initial B-meson and excited charmed mesons. In addition, the dependence of the ratio of semi-tauonic and light lepton branching fractions on the MSSM parameters tanβ and mH+ is predicted for all states of the quadruplet.
