Summer Student Report Discovery of a new decay: $\Lambda^0_b \to D_s^-p$ Analysis

I report the first observation of the decay of the $\Lambda^0_b$ baryon into a $D^+_s$ meson and a proton. The $D^+_s$ is detected via its $D^+_s \to K^+K^-\pi^+$ decay channel and the $\Lambda^0_b \to D_s^-p$ branching ratio is being measured with respect to the branching ratio of the $B^0_s \to D_s^- \pi^+$ decay. The estimation of uncertainties is planned, but not part of this report.