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Observation of excited Lambda_b0 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 Lambda_b0pi+pi- spectrum with masses 5911.95 +- 0.12(stat) +- 0.03(syst) +- 0.66(Lambda_b0 mass) MeV/c^2 and 5919.76 +- 0.07(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2. The significances of the observations are 4.9 and 10.1 standard deviations, respectively. These states are interpreted as the orbitally-excited Lambda_b0 baryons, Lambda_b*0(5912) and Lambda_b*0(5920).
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Submitted on : Wednesday, May 16, 2012 - 1:51:46 PM
Last modification on : Thursday, December 16, 2021 - 2:11:13 PM

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R. Aaij, C. Adrover, Ziad Ajaltouni, E. Aslanides, S. Barsuk, et al.. Observation of excited Lambda_b0 baryons. Physical Review Letters, American Physical Society, 2012, 109, pp.172003. ⟨10.1103/PhysRevLett.109.172003⟩. ⟨in2p3-00698050⟩



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