Observation of the Decay B-→Ds(*)+K-ℓ-ν̅ ℓ
We report the observation of the decay B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ based on 342 fb[superscript -1] of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e[superscript +]e[superscript -] storage rings at SLAC. A simul...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/67319 https://orcid.org/0000-0002-8667-5660 |
| Summary: | We report the observation of the decay B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ based on 342 fb[superscript -1] of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e[superscript +]e[superscript -] storage rings at SLAC. A simultaneous fit to three D[subscript s][superscript +] 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[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ)=[6.13[subscript -1.03][superscript +1.04](stat)±0.43(syst)±0.51(B(D[subscript s]))]×10[superscript -4], where the last error reflects the limited knowledge of the D[subscript s] branching fractions. |
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