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Search for $B_c^+$ decays to two charm mesons

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Abstract

A search for decays of $B_c^+$ mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are $B_c^+\to D^{(*)+}_{(s)} \overline{D}^{(*)0}$ and $B_c^+\to D^{(*)+}_{(s)} D^{(*)0}$, which are normalised to high-yield $B^+\to D^+_{(s)} \overline{D}^0$ decays. No evidence for a signal is found and limits are set on twelve $B_c^+$ decay modes.

Figures and captions

Illustration of (left) a colour-favoured $ B _ c ^+ \rightarrow D ^+_ s D ^0 $ decay, and (right) a colour-suppressed $ B _ c ^+ \rightarrow D ^+_ s \overline{ D }{} {}^0 $ decay.

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Fits to the (top row) $ D ^+_ s $ $\overline{ D }{} {}^0$ , (second row) $ D ^+_ s $ $ D ^0$ , (third row) $ D ^+$ $\overline{ D }{} {}^0$ and (bottom row) $ D ^+$ $ D ^0$ final states. For the left plots, the $ D ^0$ meson is reconstructed in the $K^-\pi^+$ final state, while the right column corresponds to the $ D ^0 \rightarrow K ^- \pi ^+ \pi ^- \pi ^+ $ mode.

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Animated gif made out of all figures.

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Tables and captions

Estimates of the branching fractions of four $ B _ c ^+ \rightarrow D ^+_{( s )} \optbar{ D}{} ^0 $ decays in units of $10^{-6}$. Decays of the $ B _ c ^+$ meson to final states with one or two excited charm mesons have similar branching fractions and can be found in the cited references.

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Ratio $\varepsilon_{ B _ c ^+ }/\varepsilon_{ B ^+ }$ of total efficiencies of $ B _ c ^+$ decays relative to the corresponding fully reconstructed $ B ^+ $ decays. The quoted uncertainties are statistical only.

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Signal yields from the fits of $ B \rightarrow D ^+_{( s )} \optbar{ D}{} ^0 $ decays. Samples with $ D ^0 \rightarrow K ^- \pi ^+ $ and $ D ^0 \rightarrow K ^- \pi ^+ \pi ^- \pi ^+ $ are fitted simultaneously. The uncertainties are statistical only.

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Systematic uncertainties on the $ B _ c ^+$ yields, for the combined fit to both the $ D ^0 \rightarrow K ^- \pi ^+ $ and the $ D ^0 \rightarrow K ^- \pi ^+ \pi ^- \pi ^+ $ decay channels. The total systematic uncertainty is calculated as the quadratic sum of the individual components.

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Systematic uncertainties, in %, on the normalisation of the $ B _ c ^+$ branching fraction determination. The total systematic uncertainty is calculated as the quadratic sum of the individual components.

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Supplementary Material [file]

Supplementary material full pdf

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Created on 20 September 2019.