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arXiv · hep-ex/0208014

First Observation of the Doubly Charmed Baryon Xi_cc^+

The SELEX Collaboration·M. Mattson
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Abstract

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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The SELEX Collaboration, M. Mattson. 2002-08-12. First Observation of the Doubly Charmed Baryon Xi_cc^+. https://doi.org/10.1103/physrevlett.89.112001

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