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arXiv · hep-ex/9906013

Evidence of New States Decaying into $Ξ_{c}^{*}π$

J. P. Alexander
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Abstract

Using data recorded by the CLEO II detector at CESR, we report evidence for two new charmed baryons, one decaying into $Ξ_c^+π^+π^-$ via an intermediate $Ξ_c^{*0}$, and its isospin partner decaying into $Ξ_c^0π^+π^-$ via an intermediate $Ξ_c^{*+}$. We measure the mass differences of the two states to be $M(Ξ_c^+π^+π^-)-M(Ξ_c^+)=$ $348.6\pm0.6\pm1.0$ MeV, and $M(Ξ_c^0π^+π^-)-M(Ξ_c^0)=$ $347.2\pm0.7\pm2.0$ MeV. We interpret these new states as the $J^P = {3 \over{2}}^- $ $Ξ_{c1}$ particles, the charmed-strange analogues of the $Λ_{c1}^+(2625)$.

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J. P. Alexander. 1999-06-14. Evidence of New States Decaying into $Ξ_{c}^{*}π$. https://doi.org/10.1103/physrevlett.83.3390

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