We report the observation of the decay B-→Ds(*)+K-ℓ-ν̅ ℓ based on 342 fb-1 of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e- storage rings at SLAC. A simultaneous fit to three Ds+ decay chains is performed to extract the signal yield from measurements of the squared missing mass in the B meson decay. We observe the decay B-→Ds(*)+K-ℓ-ν̅ ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B-→Ds(*)+K-ℓ-ν̅ ℓ)=[6.13-1.03+1.04(stat)±0.43(syst)±0.51(B(Ds))]×10-4, where the last error reflects the limited knowledge of the Ds branching fractions.
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Titolo: | Observation of the Decay B^{-}→D_{s}^{(*)+}K^{-}ℓ^{-}ν[over ¯]_{ℓ} | |
Autori: | ||
Data di pubblicazione: | 2011 | |
Rivista: | ||
Abstract: | We report the observation of the decay B-→Ds(*)+K-ℓ-ν̅ ℓ based on 342 fb-1 of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e- storage rings at SLAC. A simultaneous fit to three Ds+ decay chains is performed to extract the signal yield from measurements of the squared missing mass in the B meson decay. We observe the decay B-→Ds(*)+K-ℓ-ν̅ ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B-→Ds(*)+K-ℓ-ν̅ ℓ)=[6.13-1.03+1.04(stat)±0.43(syst)±0.51(B(Ds))]×10-4, where the last error reflects the limited knowledge of the Ds branching fractions. | |
Handle: | http://hdl.handle.net/11567/331703 | |
Appare nelle tipologie: | 01.01 - Articolo su rivista |