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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 76, p. -

Search for B+→τ+ν

Aubert B., Bona M., Boutigny D., Karyotakis Y., Lees J. P., Poireau V., Prudent X., Tisserand V., Zghiche A., Garra Tico J., Grauges E., Lopez L., Palano A., 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., Lopes Pegna D., Lynch G., Mir L. M., Orimoto T. J., Ronan M. T., Tackmann K., Wenzel W. A., Del Amo Sanchez P., Hawkes C. M., Watson A. T., Held T., Koch H., Lewandowski B., Pelizaeus M., Schroeder T., Steinke M., Walker D., Asgeirsson D. J., Cuhadar-Donszelmann T., Fulsom B. G., Hearty C., Mattison T. S., McKenna J. A., Khan A., Saleem M., Teodorescu L., Blinov V. E., Bukin A. D., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Martin E. C., Stoker D. P., Abachi S., Buchanan C., Foulkes S. D., Gary J. W., Liu F., Long O., Shen B. C., Zhang L., Paar H. P., Rahatlou S., Sharma V., Berryhill J. W., Campagnari C., Cunha A., Dahmes B., Hong T. M., Kovalskyi D., Richman J. D., Beck T. W., Eisner A. M., Flacco C. J., Heusch C. A., Kroseberg J., Lockman W. S., Schalk T., Schumm B. A., Seiden A., Williams D. C., Wilson M. G.

We present a search for the decay B+→τ+ν using 383×106BB̄ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B-→D0 -ν̄ X) is selected, and in the recoil a search for B+→τ+ν is performed. The τ is identified in the following channels: τ+→e+νν̄, τ+→μ+νν̄, τ+→π+ν̄, and τ+→π+π0ν̄. We measure a branching fraction of B(B+→τ+ν)=(0.9±0.6(stat.)±0.1(syst.))×10-4. In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B(B+→τ+ν)<1.7×10-4. We calculate the product of the B meson decay constant fB and |Vub| to be fB•|Vub|=(7.2-2. 8+2.0(stat.)±0.2(syst.))×10-4GeV. © 2007 The American Physical Society.