Confirmation of the doubly charmed baryon Ξcc+(3520) via its decay to pD+K−

2004/06/30 by The SELEX Collaboration, A. Ocherashvili, M. A. Moinester +98 · 4 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1016/j.physletb.2005.09.043

published as Phys.Lett.B628:18-24,2005 · 11 pages, 6 included eps figures. v2 includes improved statistical method to determine significance of observation. Submitted to PLB

arxiv created 2005/08/25 · openalex publication_date 2005/09/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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/c², consistent with the published result. Averaging the two results gives a mass of (3518.7+/-1.7)MeV/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 Gamma(Xi_cc+ -> pD+K-)/Gamma(Xi_cc+ -> Lambda_c K- pi+) = 0.36+/-0.21.

Cited by

• Doubly heavy baryons in QCD sum rules
• Hadronic production of the doubly heavy baryonΞbcat the LHC
• Diffractive Higgs production from intrinsic heavy flavors in the proton
• Hadronic production of the doubly charmed baryon Ξccwith intrinsic charm