First Observation of the Doubly Charmed Baryon $\Xi^+_{cc}$

Mattson, M.

doi:10.1103/PhysRevLett.89.112001

First Observation of the Doubly Charmed Baryon $$\Xi^+_{cc}$$

Journal Article · Thu Aug 01 04:00:00 EDT 2002 · Phys.Rev.Lett.

DOI:https://doi.org/10.1103/PhysRevLett.89.112001· OSTI ID:1892237

Mattson, M.

We observe a signal for the doubly charmed baryon $$\Xi_{cc}^+$$ in the charged decay mode $$\Xi_{cc}^+ \to \Lambda_c^+ K^- \pi^+$$ 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 $$\pm$$ 0.5 events, a statistical significance of 6.3$$\sigma$$. The observed mass of this state is (3519 $$\pm$$ 1) MeV/$c^2$. The Gaussian mass width of this state is 3 MeV/$c^2$, consistent with resolution: its lifetime is less than 33 fs at 90% confidence.

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: SELEX

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1892237

Report Number(s):: FERMILAB-PUB-02-183-E; arXiv:hep-ex/0208014; oai:inspirehep.net:592469

Journal Information:: Phys.Rev.Lett., Journal Name: Phys.Rev.Lett. Vol. 89

Country of Publication:: United States

Language:: English

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