Observation of a Charmed Baryon Decaying to D^0p at a Mass Near 2:94 GeV/c^2

Creators: Aubert, B.; Albert, J.; Chen, E.; Dvoretskii, A.; Hitlin, D. G.; Narsky, I.; Piatenko, T.; Porter, F. C.; Ryd, A.; Samuel, A.

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Abstract

A search for charmed baryons decaying to D^0p reveals two states: the Λ_c(2880)^+ baryon and a previously unobserved state at a mass of [2939.8±1.3(stat)±1.0(syst)] MeV/c^2 and with an intrinsic width of [17.5±5.2(stat)±5.9(syst)] MeV. Consistent and significant signals are observed for the K^-π^+ and K^-π^+π^-π^+ decay modes of the D^0 in 287 fb^(-1) annihilation data recorded by the BABAR detector at a center-of-mass energy of 10.58 GeV. There is no evidence in the D^+p spectrum of doubly charged partners. The mass and intrinsic width of the Λ_c(2880)^+ baryon and relative yield of the two baryons are also measured.

Additional Information

© 2007 The American Physical Society. Received 25 March 2006; published 4 January 2007. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from CONACyT (Mexico), Marie Curie EIF (European Union), the A. P. Sloan Foundation, the Research Corporation, and the Alexander von Humboldt Foundation.

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