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Observation of excited Λb0\Lambda_b^0 baryons

Collaboration
May, 2012
15 pages
Published in:
  • Phys.Rev.Lett. 109 (2012) 172003
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2012-128,
  • LHCB-PAPER-2012-012,
  • LHCB-PAPER-2012-12
Experiments:
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Abstract: (arXiv)
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).
Note:
  • Replaced by version published in Phys. Rev. Lett, modified fit with better mass resolution treatment
  • 14.20.Mr
  • 13.30.Eg
  • 13.60.Rj
  • Lambda/b0: excited state
  • Lambda/b0(5912): mass: measured
  • Lambda/b0(5920): mass: measured
  • LHC-B
  • width: upper limit
  • p p: interaction
  • mass spectrum: (Lambda/b0 pi+ pi-)
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