Narrow Results

We present a search for the decay B⁺ → τ⁺ν_τ in decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay is selected, and in the recoil a search for B⁺ → τ⁺ ν_τ signal is performed. The τ is identified in the following channels: , , , , . We find no evidence of signal, and we set a preliminary upper limit on the branching fraction of at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B⁺ → τ⁺ν_τ to give a combined preliminary limit of at 90% CL.

Recent results from leptonic and semi-leptonic charm decays at the BABARB–factory are presented. The measurement of f_Ds from the channel is presented. Form-factor studies from the channel are described along with a search for flavor-changing neutral-current decays.

Several recent key results from the BABAR experiment are presented, most using 383.6 fb⁻¹ of data. In particular, the search for B⁺ → τ⁺ν, inclusive and exclusive measurements of |V_ub|, measurements of b → dγ decays and new observations of rare charmless hadronic decays. The new results provide important experimental constraints on the Standard Model and new physics models.

The complete spectrum of $c\bar{b}$ states is obtained in a phenomenological nonrelativistic quark model (NRQM), which consists of a confinement potential and one gluon exchange potential (OGEP) as effective quark–antiquark potential. We make predictions for the radiative decay (E1 and M1) widths and weak decay widths of $c\bar{b}$ states in the framework of NRQM formalism.

The complete spectrum of $c\bar{b}$ states is obtained in a phenomenological nonrelativistic quark model (NRQM), which consists of a confinement potential and one gluon exchange potential (OGEP) as effective quark–antiquark potential with coupled channel effects. We make predictions for the radiative decay (E1 and M1) widths and weak decay widths of $c\bar{b}$ states in the framework of NRQM formalism.