Observation of the $\Lambda_\text{b}^0$$\to$ J/$\psi\Xi^-$K$^+$ decay
Observation of the $\Lambda_\text{b}^0$$\to$ J/$\psi\Xi^-$K$^+$ decay
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 $\Lambda_\text{b}^0$ $\to$ J/$\psi\Xi^-$K$^+$ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $\Lambda_\text{b}^0$ …