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.

Aaij, R., Abdelfatah, M., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., et al. (2026). Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector. PHYSICAL REVIEW LETTERS, 137(2) [10.1103/dmv6-7gdv].

Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector

Anelli A.;Arnone L.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Moro A.;Pizzichemi M.;Salomoni M.;
2026

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.
Articolo in rivista - Articolo scientifico
Charmed baryons; Proton collider; Particle detectors;
English
8-lug-2026
2026
137
2
021902
none
Aaij, R., Abdelfatah, M., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., et al. (2026). Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector. PHYSICAL REVIEW LETTERS, 137(2) [10.1103/dmv6-7gdv].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/625443
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