Evidence of New States Decaying into ${\Xi }_c^{\ast }\pi$

Abstract

Using data recorded by the CLEO II detector at CESR, we report evidence for two new charmed baryons, one decaying into ${\Xi }_c^{+}{\pi }^{+}{\pi }^{-}$ via an intermediate ${\Xi }_c^{\ast 0}$, and its isospin partner decaying into ${\Xi }_c^0{\pi }^{+}{\pi }^{-}$ via an intermediate ${\Xi }_c^{\ast +}$. We measure the mass differences of the two states to be $M({\Xi }_c^{+}{\pi }^{+}{\pi }^{-})-M({\Xi }_c^{+})=$ $348.6\pm 0.6\pm 1.0$ MeV, and $M({\Xi }_c^0{\pi }^{+}{\pi }^{-})-M({\Xi }_c^0)=$ $347.2\pm 0.7\pm 2.0$ MeV. We interpret these new states as the $J^P={\frac{3}{2}}^{-}$ ${\Xi }_{c1}$ particles, the charmed-strange analogues of the ${\Lambda }_{c1}^{+}(2625)$.

9 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

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