Observation of the ${\Lambda }_{\text{b}}^0$ $\to$ J/$\psi {\Xi }^{-}$K${}^{+}$ decay

CMS Collaboration

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/$ψΞ…