First observation of the decays B0bar --&gt;D+ K- pi+ pi- and B- --&gt; D0 K- pi+ pi-
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellan
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
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name: Cartelle, P. Alvarez
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name: Gutierrez, O. Aquines
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Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: First observations of the Cabibbo suppressed decays B0bar --&gt;D+ K- pi+ pi- and B- --&gt; 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 --&gt; D+ K- pi+ pi-)/B(B0bar --&gt; D+ pi- pi+ pi-)=(5.9\pm1.1\pm0.5) x 10^{-2} and B(B- --&gt; D0 K- pi+ pi-)/B(B- --&gt; D0 pi- pi+ pi-)=(9.4\pm1.3\pm0.9) x 10^{-2}, where the uncertainties are statistical and systematic, respectively. The B- --&gt; D0 K- pi+ pi- decay is particularly interesting, as it can be used in a similar way to B- --&gt; D0 K- to measure the CKM phase gamma.
description: 9 pages, 2 figures