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Search for B+->tau(+)nu decays with hadronic B tags

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Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Tico, J. Garra et al.
(2008) Search for B+->tau(+)nu decays with hadronic B tags. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.77 (No.1). doi:10.1103/PhysRevD.77.011107 ISSN 1550-7998.

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Official URL: http://dx.doi.org/10.1103/PhysRevD.77.011107

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Abstract

We present a search for the decay B+->tau(+)nu using 383x10(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 tag B in a hadronic decay mode (B-->(DX-)-X-(*)0), and 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<overline>nu</overline>, tau(+)->mu(+)nu(nu) over bar, tau(+)->pi(+)(nu) over bar, and tau(+)->pi(+)pi(0)(nu) over bar. We find a 2.2 sigma excess in data and measure a branching fraction of B(B+->tau(+)nu)=(1.8(-0.8)(+0.9)(stat.)+/- 0.4(bkg. syst.)+/- 0.2(other syst.))x10(-4). We calculate the product of the B meson decay constant f(B) and [V-ub] to be f(B)center dot[V-ub]=(10.1(-2.5)(+2.3)(stat.)(-1.5)(+1.2)(syst.))x10(-4) GeV.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: January 2008
Dates:
DateEvent
January 2008Published
Volume: Vol.77
Number: No.1
Number of Pages: 9
DOI: 10.1103/PhysRevD.77.011107
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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