Observation of Excited Λ0b Baryons

M. Adinolfi, John O Benton, N. H. Brook, A. Cook, M. Coombes, T. Hampson, S. T. Harnew, J. Imong, P. Naik, J. H. Rademacker, A. Solomin, J. J. Velthuis, D. Voong, LHCb Collaboration

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Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda_b0pi+pi- spectrum with masses 5911.97 +- 0.12(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2 and 5919.77 +- 0.08(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2. The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally-excited Lambda_b0 baryons, Lambda_b*0(5912) and Lambda_b*0(5920).
Original languageEnglish
Article number172003
Number of pages8
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 26 Oct 2012

Bibliographical note

Replaced by version published in Phys. Rev. Lett, modified fit with better mass resolution treatment


  • hep-ex


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