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Evidence of B+ -> tau(+)nu decays with hadronic B tags

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Valencià Castellano

Evidence of B+ -> tau(+)nu decays with hadronic B tags

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BABAR Collaboration; Martínez Vidal, Fernando Perfil; Oyanguren Campos, Arantza Perfil

This document is a artículoDate2013

Este documento está disponible también en : http://dx.doi.org/10.1103/PhysRevD.88.031102

Este documento está disponible también en : http://hdl.handle.net/10550/33937

We present a search for the decay B+ -> tau(+)nu using 467.8 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B- in the hadronic decay mode (B- -> D-(*X-)0(-) and B- -> J/psi X-). We examine the rest of the event to search for a B+ -> tau(+)nu decay. We identify the tau(+) lepton in the following modes: tau(+) -> e(+)nu(nu) over bar, tau(+) -> mu(+)nu(nu) over bar, tau(+) -> pi(+)(nu) over bar and tau(+) -> rho(+)(nu) over bar. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8 sigma (including systematic uncertainties) and corresponds to a branching fraction value of B(B+ -> tau(+)nu) = (1.83(-0.49)(+0.53)(stat) +/- 0.24(syst)) x 10(-4).

BABAR Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza 2013 Evidence of B+ -> tau(+)nu decays with hadronic B tags Physical Review D 88 3 031102-1 031102-9

http://dx.doi.org/10.1103/PhysRevD.88.031102