First Observation of the Doubly Charmed Baryon Xi_cc^+

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.

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

References in corpus (2)

• Hadronic Production of Lambda_c from 600 GeV/c pion, sigma and proton beams
• Precision measurements of the Lambda_c+ and D0 lifetimes

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