The first observation of the doubly charmed baryon Ξcc+ is reported through its decay to the Λc+ K- π+ final state, with a statistical significance exceeding seven standard deviations. The observation is made using proton-proton collision data collected in 2024 with the LHCb Run 3 detector at a center-of-mass energy of 13.6 TeV, corresponding to a total integrated luminosity of 6.9 fb-1. The Ξcc+ mass is measured to be 3619.97 ± 0.83 ± 0.26 -1.30/+1.90 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third is due to the unknown Ξcc+ lifetime, which is assumed to lie in the range 15-160 fs with a baseline value of 45 fs. The difference between the masses of the Ξcc+ and Ξcc++ baryons is determined to be -1.77 ± 0.84 ± 0.15 -1.30/+1.90 MeV/c2. This is the first observation of a new particle made with the LHCb Run 3 detector.
(2026). Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from https://hdl.handle.net/10446/335250
Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector
Lupato, Anna;Redi, Federico;
2026-01-01
Abstract
The first observation of the doubly charmed baryon Ξcc+ is reported through its decay to the Λc+ K- π+ final state, with a statistical significance exceeding seven standard deviations. The observation is made using proton-proton collision data collected in 2024 with the LHCb Run 3 detector at a center-of-mass energy of 13.6 TeV, corresponding to a total integrated luminosity of 6.9 fb-1. The Ξcc+ mass is measured to be 3619.97 ± 0.83 ± 0.26 -1.30/+1.90 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third is due to the unknown Ξcc+ lifetime, which is assumed to lie in the range 15-160 fs with a baseline value of 45 fs. The difference between the masses of the Ξcc+ and Ξcc++ baryons is determined to be -1.77 ± 0.84 ± 0.15 -1.30/+1.90 MeV/c2. This is the first observation of a new particle made with the LHCb Run 3 detector.| File | Dimensione del file | Formato | |
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