Confirmation Of The Doubly Charmed Baryon Ξcc +(3520) Via Its Decay To Pd+k-

By The Selex Collaboration, A.Ocherashvili, M.A.Moinester, J.Russ, J.Engelfried, I.Torres, et al. 2004

184 citations recorded by the source corpus.

Abstract We observe a signal for the doubly charmed baryon Ξ c c + in the decay mode Ξ c c + → p D + K − to complement the previous reported decay Ξ c c + → Λ c + K − π + 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 4.8σ. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 × 10 −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 for these two modes is 0.36 ± 0.21 .

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/fe207c9eaf25db7ab318e2222c1aab7dcf30c2c8

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In Nuclear and High Energy Physics

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Citations in the corpus

• The XYZ states: Experimental and theoretical status and perspectives (2019, methodology): “Earlier observations by the SELEX experiment remained unconfirmed by other experiments [649, 650] and show a huge isospin violation difficult to understand from an EFT point of view [651].”
• Charmed bottom baryon spectroscopy from lattice QCD (2014, background): “[14] SELEX Collaboration, A.”
• Exotic Hadrons: Review and Perspectives (2016, result): “Some evidence for double-charm baryons was found at Fermilab, in the SELEX experiment [83], but unfortunately not confirmed in other experiments at Fermilab or elsewhere [84].”