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Search for the suppressed decays $B^{+}\rightarrow K^{+}K^{+}\pi^{-}$ and $B^{+}\rightarrow \pi^{+}\pi^{+}K^{-}$

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Abstract

A search is made for the highly-suppressed B meson decays $B^{+}\rightarrow K^{+}K^{+}\pi^{-}$ and $B^{+}\rightarrow \pi^{+}\pi^{+}K^{-}$ using a data sample corresponding to an integrated luminosity of 3.0 $fb^{-1}$ collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. No evidence is found for the decays, and upper limits at 90% confidence level are determined to be $\mathcal{B}(B^{+}\rightarrow K^{+}K^{+}\pi^{-}) < 1.1\times 10^{-8}$ and $\mathcal{B}(B^{+}\rightarrow \pi^{+}\pi^{+}K^{-}) < 4.6\times 10^{-8}$.

Figures and captions

Main SM diagrams for the suppressed decays (left) $ B ^+ \rightarrow K ^+ K ^+ \pi ^- $ and (right) $ B ^+ \rightarrow \pi ^+ \pi ^+ K ^- $ .

 feyn_K[..].pdf [10 KiB]
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feyn_KKpi_Bp.pdf
feyn_p[..].pdf [10 KiB]
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feyn_pipiK_Bp.pdf

Invariant mass spectra of (a) $ B ^+ \rightarrow K ^+ K ^+ \pi ^- $ and (b) $ B ^+ \rightarrow K ^+ K ^- \pi ^+ $ candidates, with the results of the unbinned extended maximum likelihood fits overlaid. The dashed (blue) line represents the partially reconstructed background, the dotted (green) line the combinatorial background, the long dashed (red) line is the signal, and the solid (magenta) line the total. Residual differences between data and the fits are shown below the mass plots in units of standard deviation.

 KKPi_S[..].pdf [25 KiB]
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KKPi_SS_dofitplot_upper.pdf
KKPi_O[..].pdf [43 KiB]
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KKPi_OS_dofitplot_upper.pdf

Invariant mass spectra of (a) $ B ^+ \rightarrow \pi ^+ \pi ^+ K ^- $ and (b) $ B ^+ \rightarrow \pi ^+ \pi ^- K ^+ $ candidates, with the results of the unbinned extended maximum likelihood fits overlaid. The dashed (blue) line represents the partially reconstructed background, the dotted (green) line the combinatorial background, the long dashed (red) line is the signal, the dot-dash (dark green) line the $ B ^0_ s $ four-body backgrounds, and the solid (magenta) line the total. Residual differences between data and the fits are shown below the mass plots in units of standard deviation.

 KPiPi_[..].pdf [25 KiB]
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KPiPi_SS_dofitplot_upper.pdf
KPiPi_[..].pdf [43 KiB]
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KPiPi_OS_dofitplot_upper.pdf

Feldman-Cousins 90% (green) and 95% (yellow) confidence level (CL) bands for (a) $ B ^+ \rightarrow K ^+ K ^+ \pi ^- $ and (b) $ B ^+ \rightarrow \pi ^+ \pi ^+ K ^- $ , including statistical and systematic uncertainties. The black solid line shows the expected central value of the true branching fraction as a function of the fitted number of signal events. The horizontal dotted lines show the 90% CL upper limits on the branching fractions prior to the present measurement. The dashed lines in the lower left corner of each figure show the equivalent 90% CL upper limits reported in this paper.

 limits[..].pdf [63 KiB]
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limits-kkp_fitted.pdf
limits[..].pdf [25 KiB]
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limits-ppk_fitted.pdf

Animated gif made out of all figures.

 PAPER-2016-023.gif
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thumbnail_PAPER-2016-023.gif

Tables and captions

Systematic uncertainties on the $ B ^+ \rightarrow K ^+ K ^+ \pi ^- $ and $ B ^+ \rightarrow \pi ^+ \pi ^+ K ^- $ branching fractions in units of $10^{-8}$ and $10^{-9}$, respectively.

 Table_1.pdf [48 KiB]
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tex code 		Table_1.pdf

Created on 27 April 2024.