Details

Autor(en) / Beteiligte

• Alfonso Albero, Alejandro
• Badalov, Alexey
• Calvo Gómez, Míriam
• Camboni, Alessandro
• Coquereau, Samuel
• Fernandez, G
• Garrido Beltrán, Lluís
• Gascón Fora, David
• Graciani Díaz, Ricardo
• Graugés Pous, Eugeni
• Marin Benito, Carla
• Picatoste Olloqui, Eduardo
• Rives Molina, Vicente José
• Sánchez Gonzalo, David
• Vilasis-Cardona, Xavier
• LHCb Collaboration

Titel

Observation of the Doubly Charmed Baryon Ξ++cc

Ist Teil von

• Physical review letters, 2017-09, Vol.119 (11)

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2017

Link zum Volltext

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• A highly significant structure is observed in the Λc+K-π+π+ mass spectrum, where the Λc+ baryon is reconstructed in the decay mode p K-π+. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξcc ++. The difference between the masses of the Ξcc ++ and Λc+ states is measured to be 1334.94 ±0.72 (stat.) ±0.27 (syst. ) MeV /c2 , and the Ξcc ++ mass is then determined to be 3621.40 ±0.72 (stat.) ±0.27 (syst. ) ±0.14 (Λc+) MeV /c2 , where the last uncertainty is due to the limited knowledge of the Λc+ mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb-1, and confirmed in an additional sample of data collected at 8 TeV.