Using data recorded by the CLEO II detector at the Cornell Electron Storage Ring, we report evidence for two new charmed baryons, one decaying into Ξ+cπ+π− via an intermediate Ξ*0c and its isospin partner decaying into Ξ0cπ+π− via an intermediate Ξ*+c. We measure the mass differences of the two states to be M(Ξ+cπ+π−)−M(Ξ+c)=348.6±0.6±1.0 MeV, and M(Ξ0cπ+π−)− M(Ξ0c)=347.2±0.7±2.0 MeV. We interpret these new states as the JP = 3/2− Ξc1 particles, the charmed-strange analogs of the Λ+c1(2625).
Bibliographical noteFunding Information:
We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. This work was supported by the National Science Foundation, the U.S. Department of Energy, the Research Corporation, the Natural Sciences and Engineering Research Council of Canada, the A. P. Sloan Foundation, the Swiss National Science Foundation, and the Alexander von Humboldt Stiftung.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)