Observation of the $\hat{I}{›}_{\text{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}{ž}^{-}$K${}^{+}$ decay

Abstract

Using proton-proton collision data corresponding to an integrated luminosity of 140 fb${}^{-1}$ collected by the CMS experiment at $\sqrt{s}$ = 13 TeV, the $\hat{I}{›}_{\text{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}{ž}^{-}$K${}^{+}$ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $\hat{I}{›}_{\text{b}}^0$ $\to$ $\ddot{I}ˆ$(2S)$\hat{I}›$ decay, is measured to be $\mathcal{B}$($\hat{I}{›}_{\text{b}}^0$ $\to$ J/$\ddot{I}ˆ\hat{I}{ž}^{-}$K${}^{+}$) / $\mathcal{B}$( $\hat{I}{›}_{\text{b}}^0$ $\to$ $\ddot{I}ˆ$(2S)$\hat{I}›$) = [3.38 $\pm$ 1.02 $\pm$ 0.61 $\pm$ 0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in $\mathcal{B}$($\ddot{I}ˆ$(2S) $\to$ J/$\ddot{I}ˆ\ddot{I}{€}^{+}\ddot{I}{€}^{-}$) and $\mathcal{B}$($\hat{I}{ž}^{-}$ $\to$ $\hat{I}›\ddot{I}{€}^{-}$).

Replaced 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-22-002 (CMS Public Pages)