A highly significant structure is observed in the Λ_c^+K^-π^+π^+ mass spectrum, where the Λ_c^+ baryon is reconstructed in the decay mode pK^-π^+. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ_cc^++. The difference between the masses of the Ξ_cc^++ and Λ_c^+ states is measured to be 1334.94±0.72(stat.)±0.27(syst.)  MeV/c^2, and the Ξ_cc^++ mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ_c^+)  MeV/c^2, where the last uncertainty is due to the limited knowledge of the Λ_c^+ 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.

Observation of the Doubly Charmed Baryon Ξ_cc^++

Veltri, M;
2017-01-01

Abstract

A highly significant structure is observed in the Λ_c^+K^-π^+π^+ mass spectrum, where the Λ_c^+ baryon is reconstructed in the decay mode pK^-π^+. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ_cc^++. The difference between the masses of the Ξ_cc^++ and Λ_c^+ states is measured to be 1334.94±0.72(stat.)±0.27(syst.)  MeV/c^2, and the Ξ_cc^++ mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ_c^+)  MeV/c^2, where the last uncertainty is due to the limited knowledge of the Λ_c^+ 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2666790
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