Search for B{sup +}{yields}{tau}{sup +}{nu}

Journal Article · Sat Sep 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.052002· OSTI ID:21027670

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[1]; Garra Tico, J; Grauges, E ^[2]; Lopez, L; Palano, A ^[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 a search for the decay B{sup +}{yields}{tau}{sup +}{nu} using 383x10{sup 6}BB pairs collected at the {upsilon}(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B{sup -}{yields}D{sup 0}l-{nu}{sub l}X) is selected, and in the recoil a search for B{sup +}{yields}{tau}{sup +}{nu} is performed. The {tau} is identified in the following channels: {tau}{sup +}{yields}e{sup +}{nu}{nu}, {tau}{sup +}{yields}{mu}{sup +}{nu}{nu}, {tau}{sup +}{yields}{pi}{sup +}{nu}, and {tau}{sup +}{yields}{pi}{sup +}{pi}{sup 0}{nu}. We measure a branching fraction of B(B{sup +}{yields}{tau}{sup +}{nu})=(0.9{+-}0.6(stat.){+-}0.1(syst.))x10{sup -4}. In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B(B{sup +}{yields}{tau}{sup +}{nu})<1.7x10{sup -4}. We calculate the product of the B meson decay constant f{sub B} and |V{sub ub}| to be f{sub B}{center_dot}|V{sub ub}|=(7.2{sub -2.8}{sup +2.0}(stat.){+-}0.2(syst.))x10{sup -4} GeV.

• OSTI ID: 21027670
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MINUS MESONS
B PLUS MESONS
BRANCHING RATIO
D NEUTRAL MESONS
GEV RANGE
MESON FACTORIES
MULTIPARTICLE SPECTROMETERS
MUONS PLUS
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
PIONS MINUS
PIONS PLUS
POSITRONS
RECOILS
STANDARD MODEL
TAU NEUTRINOS
TAU PARTICLES