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First observation of the decays $\overline{B}^0 \to D^+ K^- \pi^+ \pi^-$ and $B^- \to D^0 K^- \pi^+ \pi^-$

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Abstract

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.

Figures and captions

Invariant mass distributions for (a) $\overline{ B }{} ^0 \rightarrow D^+\pi^-\pi^+\pi^-$, (b) $B^-\rightarrow D^0\pi^-\pi^+\pi^-$, (c) $\overline{ B }{} ^0 \rightarrow D^+K^-\pi^+\pi^-$ and (d) $B^-\rightarrow D^0 K^-\pi^+\pi^-$ candidates from 35 $\rm pb^{-1}$ of data for all selected candidates. Fits as described in the text are overlaid.

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b2dcha1_cssel_35pb.pdf
b2d0a1[..].pdf [16 KiB]
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b2d0a1_cssel_35pb.pdf
b2dchk[..].pdf [15 KiB]
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b2dchk1_NoK1MassCut_DsVeto_35pb.pdf
b2d0k1[..].pdf [15 KiB]
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b2d0k1_NoK1MassCut_DsVeto_35pb.pdf

Invariant masses within the $B^-\rightarrow D^0 K^-\pi^+\pi^-$ system. Shown are (a) $M(K^-\pi^+\pi^-)$ , (b) $M(D\pi^+\pi^-)-M(D)$, (c) $M$($K^-\pi^+)$, and (d) $M(\pi^+\pi^-)$ . The points with error bars correspond to the signal region, and the hatched histograms represent the scaled sideband region.

 B2D0K1[..].pdf [18 KiB]
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B2D0K1_KPiPiPlots.pdf

Animated gif made out of all figures.

 PAPER-2011-040.gif
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thumbnail_PAPER-2011-040.gif

Tables and captions

Summary of parameters used in the CS mass fits. Values without uncertainties are fixed in the CS mode fits, and values with uncertainties are included with a Gaussian constraint with central values and widths as indicated.

 Table_1.pdf [53 KiB]
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tex code 		Table_1.pdf

Created on 02 May 2024.