Observation of Resonances in the $\Lambda_b^0\rightarrow\Lambda_c^+\pi^+\pi^-\pi^-$ Decay Mode at CDF\,II

In a sample of events, collected with a displaced secondary vertex trigger at the CDF\,II experiment and corresponding to about 2.4~fb$^{-1}$ of integrated luminosity, the decay $\Lambda_b^0\rightarrow\Lambda_c^+\pi^+\pi^-\pi^-$ is observed. In addition, the $\Lambda_c^+\pi^+\pi^-\pi^-$ final state is studied and clear signals of the following exclusive decay channels are observed: $\Lambda_b^0 \rightarrow{\Lambda_c^{*+}}(2593,2625)[\Lambda_c^+\pi^+\pi^-]\pi^-$, $\Lambda_b^0 \rightarrow{\Sigma_c^{++}}[\Lambda_c^+\pi^+]\pi^-\pi^-$, $\Lambda_b^0 \rightarrow{\Sigma_c^{0}}[\Lambda_c^+\pi^-]\pi^+\pi^-$, and $\Lambda_b^0 \rightarrow \Lambda_c^+\rho^0\pi^-$. The observation of such exclusive decay modes will allow for additional interesting measurements in the $\Lambda_b^0$ sector.