%0 Journal Article
%T Observation of the Decay B- -> D_s(*) K- l- nu(bar)
%A BABAR Collaboration (del Amo Sanchez, P. et al
%A Lopez-March, N.
%A Martinez-Vidal, F.
%A Milanes, D. A.
%A Oyanguren, A.
%J Physical Review Letters
%D 2011
%V 107
%N 4
%I Amer Physical Soc
%@ 0031-9007
%G English
%F BABARCollaborationdelAmoSanchez_etal2011
%O WOS:000293131500002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=712), last updated on Wed, 17 Aug 2011 09:16:30 +0000
%X We report the observation of the decay B(-) -> D(s)(()*()+)K(-)l(-)(nu) over bar (l) based on 342 fb(-1) of data collected at the Y(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(s)(()*()+)K(-)l(-)(nu) over bar (l) with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B(-) -> D(s)(()*())K(-)l(-)(nu) over bar (l) = [6.13(-1.03)(+1.04)(stat) +/- 0.43(syst) +/- 0.51 (B(D(s)))] X 10(-4), where the last error reflects the limited knowledge of the D(s) branching fractions.
%R 10.1103/PhysRevLett.107.041804
%U http://arXiv.org/abs/arXiv:1012.4158
%U https://doi.org/10.1103/PhysRevLett.107.041804
%P 041804-8pp