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Observation of the semileptonic decays B-->D*tau-nutau and evidence for B-->Dtau-nutau |
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| Authors: | Aubert B Bona M Boutigny D Karyotakis Y Lees J P Poireau V Prudent X Tisserand V Zghiche A Tico J Garra Grauges E Lopez L Palano A Pappagallo M Eigen G Stugu B Sun L Abrams G S Battaglia M Brown D N Button-Shafer J Cahn R N Groysman Y Jacobsen R G Kadyk J A Kerth L T Kolomensky Yu G Kukartsev G Pegna D Lopes Lynch G Mir L M Orimoto T J Osipenkov I L Ronan M T Tackmann K Tanabe T Wenzel W A Del Amo Sanchez P Hawkes C M Watson A T Koch H Schroeder T Walker D Asgeirsson D J Cuhadar-Donszelmann T Fulsom B G Hearty C Mattison T S McKenna J A Barrett M Khan A Saleem M Teodorescu L Blinov V E |
| Affiliation: | Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France. |
| Abstract: | We present measurements of the semileptonic decays B--->D0tau-nutau, B--->D*0tau-nutau, B0-->D+tau-nutau, and B0-->D*+tau-nutau, which are potentially sensitive to non-standard model amplitudes. The data sample comprises 232x10(6) Upsilon(4S)-->BB decays collected with the BABAR detector. From a combined fit to B- and B0 channels, we obtain the branching fractions B(B-->Dtau-nutau)=(0.86+/-0.24+/-0.11+/-0.06)% and B(B-->D*tau-nutau)=(1.62+/-0.31+/-0.10+/-0.05)% (normalized for the B0), where the uncertainties are statistical, systematic, and normalization-mode-related. |
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