Searches for the decays B{sup 0}{yields}l{sup {+-}}{tau}{sup {+-}} and B{sup +}{yields}l{sup +}{nu} (l=e, {mu}) using hadronic tag reconstruction

Journal Article · Thu May 01 00:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.091104· OSTI ID:21250083

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Tico, J Garra; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N; Button-Shafer, J ^[5]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We present searches for the leptonic decays B{sup +}{yields}l{sup +}{nu} and the lepton flavor violating decays B{sup 0}{yields}l{sup {+-}}{tau}{sup {+-}}, where l=e, {mu}, with data collected by the BABAR experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying B in {upsilon}(4S){yields}BB events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378x10{sup 6} BB pairs (342 fb{sup -1}), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B(B{sup +}{yields}e{sup +}{nu})<5.2x10{sup -6}, B(B{sup +}{yields}{mu}{sup +}{nu})<5.6x10{sup -6}, B(B{sup 0}{yields}e{sup +}{tau}{sup -})<2.8x10{sup -5} and B(B{sup 0}{yields}{mu}{sup +}{tau}{sup -})<2.2x10{sup -5}, are obtained at 90% confidence level.

• OSTI ID: 21250083
• Journal Information: Physical Review. D, Particles Fields, Vol. 77, Issue 9; Other Information: DOI: 10.1103/PhysRevD.77.091104; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
B PLUS MESONS
BORON IONS
BRANCHING RATIO
DISTRIBUTION
ELECTRONS
FLAVOR MODEL
HADRONS
LEPTONIC DECAY
LEPTONS
MUONS
NEUTRINOS
STANFORD LINEAR ACCELERATOR CENTER
TAU PARTICLES