We report the observation of the decay B⊃-→Ds(*)+K⊃- ⊃-ν̄ based on 342fb⊃-1 of data collected at the ε(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⊃-⊃- ν̄ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B⊃-→Ds(*)+K⊃-⊃-ν̄)=[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.
Sanchez P., D., Lees J., P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Observation of the decay B⊃-→Ds(*)+K⊃-⊃- ν. PHYSICAL REVIEW LETTERS, 107(4) [10.1103/PhysRevLett.107.041804].
Observation of the decay B⊃-→Ds(*)+K⊃-⊃- ν
CARPINELLI, MassimoMembro del Collaboration Group
;
2011
Abstract
We report the observation of the decay B⊃-→Ds(*)+K⊃- ⊃-ν̄ based on 342fb⊃-1 of data collected at the ε(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⊃-⊃- ν̄ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B⊃-→Ds(*)+K⊃-⊃-ν̄)=[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.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
