Measurement of $Br(\Lambda_b^0 \to \Lambda_c^+ \pi^- \pi^+ \pi^-)$

In this report, the measurement of the branching ratio $Br(\Lambda_b^0 \to \Lambda_c^+ \pi^- \pi^+ \pi^-)$ is described. The measurement is done by comparing the closely related mesonic decay, $B^0 \to D^* 3\pi; D^* \to K^- \pi^+ \pi^+$. The result is $Br(\Lambda_b^0 \to \Lambda_c^+ \pi^- \pi^+ \pi^-) = (5.05 \pm 0.06(\text{stat.}) \pm 0.64(\text{syst.}) ) \times 10^{-3}$.