TY  - JOUR
AU  - BABAR Collaboration (del Amo Sanchez, P. et al
AU  - Lopez-March, N.
AU  - Martinez-Vidal, F.
AU  - Milanes, D. A.
AU  - Oyanguren, A.
PY  - 2011
DA  - 2011//
TI  - Observation of the Decay B- -> D_s(*) K- l- nu(bar)
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 041804
EP  - 8pp
VL  - 107
IS  - 4
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - http://arXiv.org/abs/arXiv:1012.4158
UR  - https://doi.org/10.1103/PhysRevLett.107.041804
DO  - 10.1103/PhysRevLett.107.041804
LA  - English
N1  - WOS:000293131500002
ID  - BABARCollaborationdelAmoSanchez_etal2011
ER  -