2130-MeV ${\Lambda }^{0}p$ Mass Enhancement in the Reaction $K^{-}d\to {\Lambda }^{0}p{\pi }^{-}$ at 1.45 and 1.65 $\frac{\mathrm{GeV}}{c}$

An enhancement in the ${\Lambda }^{0}p$ mass spectrum from the reaction $K^{-}d\to {\Lambda }^{0}p{\pi }^{-}$ at $K^{-}$ momenta of 1.45 and 1.65 $\frac{\mathrm{GeV}}{c}$ is reported. The peak of the distribution occurs at $\simeq 2129$ MeV and the width at half-height is $\simeq 10$ MeV. A possible interpretation of this effect is given.