Observation of New States Decaying into ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}$ and ${\Lambda }_c^{+}{K}_S^0{\pi }^{-}$

Abstract

We report the first observation of two charmed strange baryons that decay into ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}$. The broader of the two states is measured to have a mass of $2978.5\pm 2.1\pm 2.0$ MeV/$c^2$ and a width of $43.5\pm 7.5\pm 7.0$ MeV/$c^2$. The mass and width of the narrow state are measured to be $3076.7\pm 0.9\pm 0.5$ MeV/$c^2$ and $6.2\pm 1.2\pm 0.8$ MeV/$c^2$, respectively. We also perform a search for the isospin partner states that decay into ${\Lambda }_c^{+}{K}_S^0{\pi }^{-}$ and observe a significant signal at the mass of $3082.8\pm 1.8\pm 1.5$ MeV/$c^2$. The data used for this analysis was accumulated at or near the ${\rm Y}(4S)$ resonance, using the Belle detector at the $e^{+}{e}^{-}$ asymmetric-energy collider KEKB. The integrated luminosity of the data sample used is $461.5{\mathrm{fb}}^{-1}$.

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