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

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

1999-06-08

arxiv.org/abs/hep-ex/9906013v2

Phys.Rev.Lett.83:3390-3393,1999

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.83.3390

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 $\Xi_c^{*0}$, and its isospin partner decaying into $\Xi_c^0\pi^+\pi^-$ via an intermediate $\Xi_c^{*+}$. We measure the mass differences of the two states to be $M(\Xi_c^+\pi^+\pi^-)-M(\Xi_c^+)=$ $348.6\pm0.6\pm1.0$ MeV, and $M(\Xi_c^0\pi^+\pi^-)-M(\Xi_c^0)=$ $347.2\pm0.7\pm2.0$ MeV. We interpret these new states as the $J^P = {3 \over{2}}^- $ $\Xi_{c1}$ particles, the charmed-strange analogues of the $\Lambda_{c1}^+(2625)$.

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