First Observation of the Doubly Charmed Baryon Xi_cc^+

Details First Observation of the Doubly Charmed Baryon Xi_cc^+ First Observation of the Doubly Charmed Baryon Xi_cc^+

2002-08-12

arxiv.org/abs/hep-ex/0208014v1

Phys.Rev.Lett.89:112001,2002

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 3 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.89.112001

We observe a signal for the doubly charmed baryon Xi_cc^+ in the charged decay mode Xi_cc^+ --> Lambda_c^+ K- pi+ in data from SELEX, the charm hadro-production experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1 +/- 0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is (3519 +/- 1) MeV/c^2. The Gaussian mass width of this state is 3MeV/c^2, consistent with resolution; its lifetime is less than 33fsec at 90% confidence.

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