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Article
Report number arXiv:2002.05112 ; CERN-EP-2020-013 ; LHCb-PAPER-2019-045 ; LHCB-PAPER-2019-045
Title Observation of a new baryon state in the Λ0bπ+πΛ0bπ+π mass spectrum
Author(s) LHCb Collaboration  Mostra tots els 911 autors
Publication 2020-06-23
Imprint 13 Feb 2020
Number of pages 24
Note 24 pages, 6 figures, All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-045.html
In: JHEP 2006 (2020) 136
DOI 10.1007/JHEP06(2020)136
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; QCD ; forward physics ; B physics ; heavy quark production ; particle and resonance production
Abstract A new baryon state is observed in the Λ0bπ+πΛ0bπ+π mass spectrum with high significance using a data sample of pppp collisions, collected with the LHCb detector at centre-of-mass energies s=7,8s=7,8 and 1313 TeV, corresponding to an integrated luminosity of 9 fb11. The mass and natural width of the new state are measured to be m=6072.3±2.9±0.6±0.2MeV,Γ=72±11±2MeV,m=6072.3±2.9±0.6±0.2MeV,Γ=72±11±2MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0bΛ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0bΛ0b baryon, the Λb(2S)0Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0Λb(5912)0 and Λb(5920)0Λb(5920)0 states are also reported.
Copyright/License Preprint: © 2020-2025 CERN (License: CC-BY-4.0)



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