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Updated search for $B_c^+$ decays to two charm mesons

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Abstract

A data set corresponding to an integrated luminosity of $9 \text{fb}^{-1}$ of proton-proton collisions collected by the LHCb experiment has been analysed to search for $B_c^+ \to D^{(*)+}_{(s)} \overset{\scriptstyle (-)}{D}{}^{(*)0}$ decays. The decays are fully or partially reconstructed, where one or two missing neutral pions or photons from the decay of an excited charm meson are allowed. Upper limits for the branching fractions, normalised to $B^+$ decays to final states with similar topologies, are obtained for fourteen $B_c^+$ decay modes. For the decay $B_c^+ \to D_s^+ {\overline{D}}^0$, an excess with a significance of 3.4 standard deviations is found.

Figures and captions

Diagrams for the (left) CKM-favoured, colour-suppressed $ B _ c ^+ \rightarrow D ^+_ s \overline{ D } {}^0 $ and (right) CKM-suppressed, colour-favoured $ B _ c ^+ \rightarrow D ^+_ s D ^0 $ decays.

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Invariant-mass distributions for the selected $ B ^+_{( c )}$ candidates in the highest BDT samples for (top left) $ D ^+_ s $ $\overline{ D } {}^0$ , (top right) $ D ^+_ s $ $ D ^0$ , (center left) $ D ^+$ $\overline{ D } {}^0$ , (center right) $ D ^+$ $ D ^0$ , (bottom left) $ D ^{*+}$ $\overline{ D } {}^0$ and (bottom right) $ D ^{*+}$ $ D ^0$ , final states. The overlaid curves correspond to the sum of the corresponding fit results.

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Invariant-mass distributions for the selected $ B ^+ $ candidates in the highest BDT samples, in the region near the $ B ^+ $ mass, for (left) $ D ^+_ s $ $\overline{ D } {}^0$ and (right) $ D ^+_ s $ $ D ^0$ final states. The overlaid curves correspond to the sum of the corresponding fit results.

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Tables and captions

Predicted branching fractions of $ B _ c ^+$ decays to two charm mesons, in units of $10^{-6}$.

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Effective contributions of the systematic uncertainties which are expressed as a relative uncertainty on the branching fraction ratio, combined over all BDT samples and $ D ^0$ decay modes, given in percent.

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Upper limits on the branching fraction ratios $R$, $R_{(+,0)}'$ and $R''$ of $ B _ c ^+$ to $ B ^+ $ decays, defined in Eqs. 1--5, at the 90(95)% C.L. for Run 2 and Run 1 data, in units of $10^{-3}$.

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Supplementary Material [file]

Supplementary material full pdf

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Created on 26 April 2024.