Observation of B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ and B${}_{\mathrm{S}}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$ decays

Abstract

Using a data sample of $\sqrt{s}=$ 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb${}^{-1}$, the B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$ and B${}_{\mathrm{S}}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $\mathcal{B}$(B${}_{\mathrm{S}}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$) / $\mathcal{B}$(B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$) = (3.33 $\pm$ 0.69 (stat) $\pm$ 0.11 (syst) $\pm$ 0.34 ($f_{\mathrm{s}}/f_{\mathrm{d}}$)) $\times$ 10${}^{-2}$ and $\mathcal{B}$(B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$) / $\mathcal{B}$(B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$) = 0.480 $\pm$ 0.013 (stat) $\pm$ 0.032 (syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B${}_{\mathrm{s}}^0$ and B${}^0$ mesons, $f_{\mathrm{s}}/f_{\mathrm{d}}$.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-004 (CMS Public Pages)

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