First Observation of the Doubly Charmed Baryon Xi_cc^+
Preprint
- 12 August 2002
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.Keywords
All Related Versions
- Version 1, 2002-08-12, ArXiv
- Published version: Physical Review Letters, 89 (11), 112001.
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