A Search for with Hadronic tags
Collaboration
8 pages
Published in:
- Phys.Rev.D 77 (2008) 011107
e-Print:
- 0708.2260 [hep-ex]
Report number:
- BABAR-PUB-07-046,
- SLAC-PUB-12736
Experiments:
View in:
Citations per year
Abstract: (arXiv)
We present a search for the decay B^+ --> tau^+ nu using 383 \times 10^{6}} BBbar 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 (), 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 nu,tau^+ --> mu^+ nu nu, tau^+ --> pi^+ nu and tau^+ --> pi^+ pi^0 nu. We find a 2.2 sigma excess in data and measure a branching fraction of B(B+ --> tau^+ nu) = (1.8^{+0.9}_{-0.8}(stat.) \pm 0.4(bkg. syst.) \pm 0.2 (other syst.)) \times 10^{4}. We calculate the product of the B meson decay constant f_{B} and |V_{ub}| to be f_{B} |V_{ub}| = (10.1^{+2.3}_{-2.5}(stat.)^{+1.2}_{-1.5}(syst.))\times10^{-4} GeVNote:
- 8 pages, 2 figures, submitted to Physics Review D - Rapid Communications
- 13.20.-v
- 13.25.Hw
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B+: leptonic decay
- tau+: decay modes
- B-: hadronic decay
- B+: branching ratio
References(17)
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