We search for the rare leptonic decay B+->tau(+)nu(tau) in a sample of 232x10(6) B (B) over bar pairs collected with the BABAR detector at the SLAC PEP-II B-Factory. Signal events are selected by examining the properties of the B meson recoiling against the semileptonic decay B--> D(*0)l(-)nu(l). We find no evidence for a signal and set an upper limit on the branching fraction of B(B+->tau(+)nu(tau))< 2.8x10(-4) at the 90% confidence level. We combine this result with a previous, statistically independent BABAR search for B+->tau(+)nu(tau) to give an upper limit of B(B+->tau(+)nu(tau))< 2.6x10(-4) at the 90% confidence level.
Search for the decay B+ -> tau(+)nu(tau)
ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;
2006
Abstract
We search for the rare leptonic decay B+->tau(+)nu(tau) in a sample of 232x10(6) B (B) over bar pairs collected with the BABAR detector at the SLAC PEP-II B-Factory. Signal events are selected by examining the properties of the B meson recoiling against the semileptonic decay B--> D(*0)l(-)nu(l). We find no evidence for a signal and set an upper limit on the branching fraction of B(B+->tau(+)nu(tau))< 2.8x10(-4) at the 90% confidence level. We combine this result with a previous, statistically independent BABAR search for B+->tau(+)nu(tau) to give an upper limit of B(B+->tau(+)nu(tau))< 2.6x10(-4) at the 90% confidence level.File in questo prodotto:
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