We report the observation of the decay B−→D(*)+sK−ℓ−ν⎯⎯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 D+s 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−→D(*)+sK−ℓ−ν⎯⎯ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be ℬ(B−→D(*)+sK−ℓ−ν⎯⎯ℓ)=[6.13+1.04−1.03(stat)±0.43(syst)±0.51(ℬ(Ds))]×10−4, where the last error reflects the limited knowledge of the Ds branching fractions.

Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Observation of the Decay B(-) -> D(s)(()*()+)K(-)l(-)(nu)over-bar(l). PHYSICAL REVIEW LETTERS, 107(4), 1-8 [10.1103/PhysRevLett.107.041804].

Observation of the Decay B(-) -> D(s)(()*()+)K(-)l(-)(nu)over-bar(l)

PATRIGNANI, CLAUDIA;
2011

Abstract

We report the observation of the decay B−→D(*)+sK−ℓ−ν⎯⎯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 D+s 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−→D(*)+sK−ℓ−ν⎯⎯ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be ℬ(B−→D(*)+sK−ℓ−ν⎯⎯ℓ)=[6.13+1.04−1.03(stat)±0.43(syst)±0.51(ℬ(Ds))]×10−4, where the last error reflects the limited knowledge of the Ds branching fractions.
2011
Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Observation of the Decay B(-) -> D(s)(()*()+)K(-)l(-)(nu)over-bar(l). PHYSICAL REVIEW LETTERS, 107(4), 1-8 [10.1103/PhysRevLett.107.041804].
Sanchez, P. del Amo; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Palano, A.; Pappagallo, M.; E...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537531
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