Observation of Two Narrow States Decaying into $Ξ_{c}^{+}γ$ and $Ξ_{c}^{0}γ$

Details Observation of Two Narrow States Decaying into $Ξ_{c}^{+}γ$ and $Ξ_{c}^{0}γ$ Observation of Two Narrow States Decaying into $Ξ_{c}^{+}γ$ and $Ξ_{c}^{0}γ$

1998-10-21

arxiv.org/abs/hep-ex/9810036v1

Phys.Rev.Lett.82:492-496,1999

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.82.492

We report the first observation of two narrow charmed strange baryons decaying to $\Xi_c^+\gamma$ and $\Xi_c^0\gamma$, respectively, using data from the CLEO II detector at CESR. We interpret the observed signals as the $\Xi_c^{+\prime}(c{su})$ and $\Xi_c^{0\prime}(c{sd})$, the symmetric partners of the well-established antisymmetric $\Xi_c^+(c[su])$ and $\Xi_c^0(c[sd])$. The mass differences $M(\Xi_c^{+\prime})-M(\Xi_c^+)$ and $M(\Xi_c^{0\prime})-M(\Xi_c^0)$ are measured to be $107.8\pm 1.7\pm 2.5$ and $107.0\pm 1.4\pm 2.5 MeV/c^2$, respectively.

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