Confirmation of a New $\Lambda \pi$ Resonance in the Reaction $K^{-}n\to \Lambda {\pi }^{+}{\pi }^{-}{\pi }^{-}$

Evidence is presented to confirm the existence of a new $\Lambda \pi$ resonance in the $\Lambda {\pi }^{+}{\pi }^{-}{\pi }^{-}$ final state from $K^{-}d$ interactions at 4.5 GeV/c. A mass of 1642 ± 12 MeV and a width of 55 ± 24 MeV are obtained. Upper limits on $\Sigma \pi$ and $\Lambda \mathrm{}\left(1405\right)\mathrm{}\pi$ branching ratios are obtained for the first time. The branching ratios are found to be consistent with an octet assignment.