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.

Observation of the Decay B^{-}→D_{s}^{(*)+}K^{-}ℓ^{-}ν[over ¯]_{ℓ}

LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2011

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/331703
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