First Observation of Doubly Charmed Baryons

Details First Observation of Doubly Charmed Baryons First Observation of Doubly Charmed Baryons

2002-12-12

arxiv.org/abs/hep-ex/0212029v1

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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