Study of Exclusive Semileptonic B Meson Decays to Tau Leptons

Study of Exclusive Semileptonic B Meson Decays to Tau Leptons

357 pages· 2007· ISBN 9780549268611
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We present the results of a search for four exclusive semileptonic decays B → D(*)tau -nutau in 209 fb -1 of data collected with the BABAR detector, corresponding to 232 million e+e - → Upsilon(4S) → B B events. We select events with a D (*) meson and a light lepton (e or mu) recoiling against a fully-reconstructed B meson. We perform a fit to the lepton spectrum and missing mass squared to discriminate signal events from backgrounds, predominantly B → D (*)ℓ-nuℓ . A control sample of identified D**ℓ- nuℓ events is included in the fit to estimate the background contribution from these decays. We measure B (B → Dtaunu) = (0.86+/-0.24+/-0.11+/-0.06)% and B (B → D*taunu) = (1.62+/-0.31+/-0.10+/-0.05)%, where the errors are statistical, systematic, and normalization-mode related, respectively, and where the results are expressed for the B0 lifetime.

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