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Confirmation of the Double Charm Baryon Xi_cc+ via its Decay to p D+ K-

The SELEX Collaboration·A. Ocherashvili·M. A. Moinester·J. Russ·J. Engelfried·I. Torres
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Abstract

We observes a signal for the double charm baryon Xi_cc+ in the charged decay mode Xi_cc+ -> p D+ K- to complement the previously reported decay Xi_cc+ -> Lambda_c K- pi+ in data from SELEX, the charm hadro-production experiment (E781) at Fermilab. In this new decay mode we observe an excess of 5.62 events over an expected background estimated by event mixing to be 1.38+/-0.13 events. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4E-4. The observed mass of this state is (3518+/-3)MeV/c^2, consistent with the published result. Averaging the two results gives a mass of (3518.7+/-1.7)MeV/c^2. 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 Gamma(Xi_cc+ -> pD+K-)/Gamma(Xi_cc+ -> Lambda_c K- pi+) = 0.36+/-0.21.

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The SELEX Collaboration, A. Ocherashvili, M. A. Moinester, J. Russ, J. Engelfried, I. Torres. 2005-08-25. Confirmation of the Double Charm Baryon Xi_cc+ via its Decay to p D+ K-. https://doi.org/10.1016/j.physletb.2005.09.043

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