Observation of excited Lambdab0 baryons
Abstract
Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambdab0pi+pi- spectrum with masses 5911.97 +- 0.12(stat) +- 0.02(syst) +- 0.66(Lambdab0 mass) MeV/c2 and 5919.77 +- 0.08(stat) +- 0.02(syst) +- 0.66(Lambdab0 mass) MeV/c2. The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally-excited Lambdab0 baryons, Lambdab*0(5912) and Lambdab*0(5920).
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