Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9860752 | Physics Letters B | 2005 | 7 Pages |
Abstract
We observe a signal for the doubly charmed baryon Îcc+ in the decay mode Îcc+âpD+Kâ to complement the previous reported decay Îcc+âÎc+KâÏ+ in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38±0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8Ï. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4Ã10â4. The observed mass of this state is 3518±3MeV/c2, consistent with the published result. Averaging the two results gives a mass of 3518.7±1.7MeV/c2. The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36±0.21.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
SELEX Collaboration SELEX Collaboration, A. Ocherashvili, M.A. Moinester, J. Russ, J. Engelfried, I. Torres, U. Akgun, G. Alkhazov, J. Amaro-Reyes, A.G. Atamantchouk, A.S. Ayan, M.Y. Balatz, N.F. Bondar, P.S. Cooper, L.J. Dauwe, G.V. Davidenko,