First observation of the decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi-

Details First observation of the decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi- First observation of the decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi-

2012-01-20

arxiv.org/abs/1201.4402v1

Physical Review Letters, 108, 161801 (2012)

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.108.161801

First observations of the Cabibbo suppressed decays B0bar -->D+ K- pi+ pi- and B- --> D0 K- pi+ pi- are reported using 35 pb^{-1} of data collected with the LHCb detector. Their branching fractions are measured with respect to the corresponding Cabibbo favored decays, from which we obtain B(B0bar --> D+ K- pi+ pi-)/B(B0bar --> D+ pi- pi+ pi-)=(5.9\pm1.1\pm0.5) x 10^{-2} and B(B- --> D0 K- pi+ pi-)/B(B- --> D0 pi- pi+ pi-)=(9.4\pm1.3\pm0.9) x 10^{-2}, where the uncertainties are statistical and systematic, respectively. The B- --> D0 K- pi+ pi- decay is particularly interesting, as it can be used in a similar way to B- --> D0 K- to measure the CKM phase gamma.

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