Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-12-12
Czech.J.PHys.53:B201-B213,2003
Physics
High Energy Physics
High Energy Physics - Experiment
Contribution to Advanced Study Institute, "Symmetries and Spin" - Praha-SPIN-2002, Workshop Chairman, M. Finger, http://mfin
Scientific paper
The SELEX experiment (E781) at Fermilab has observed two statistically compelling high mass states near 3.6 GeV/c^2, decaying to Lambda_c+ K- pi+ and Lambda_c+ K- pi+ pi+. These final states are Cabibbo-allowed decay modes of doubly charmed baryons $\Xi_{cc}^+$ and $\Xi_{cc}^{++}$, respectively. The masses are in the range expected from theoretical considerations, but the spectroscopy is surprising. SELEX also has weaker preliminary evidence for a state near 3.8 GeV/$\rm{c}^2$, a high mass state decaying to Lambda_c+ K- pi+ pi+, possibly an excited $\Xi_{cc}^{++}$ (ccu*). Data are presented and discussed.
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