English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the observation of the decay $B^{-} \rightarrow D^{(*)+}_{s} K^{-}\ell^{-} \bar{\nu}_{\ell}$ based on $342 \mathrm {\,fb}^{-1}}$ of datacollected at the $\Y4S$ 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 thesquared missing mass in the B meson decay. We observe the decay $B^{-}\rightarrow D^{(*)+}_{s} K^{-} \ell^{-} \bar{\nu}_{\ell}$ with a significancegreater than five standard deviations (including systematic uncertainties) andmeasure its branching fraction to be $\BR(B^{-} \rightarrow D^{(*)+}_{s} K^{-}\ell^{-} \bar{\nu}_{\ell}) =[6.13^{+1.04}_{-1.03}(\mathrm{stat.})\pm0.43(\mathrm{syst.}) \pm0.51(\BR(D_{s}))]\times10^{-4}$, where the last error reflects the limitedknowledge of the $D_{s}$ branching fractions.

Observation of the Decay B^{-} \rightarrow D_{s}^{(*)+} K^{-} \ell^{-} \bar{\nu}_{\ell}