Observation of Excited Λb0 Baryons
Abstract
Using pp collision data corresponding to 1.0fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λb0π+π- spectrum with masses 5911.97±0.12(stat)±0.02(syst)±0.66(Λb0mass)MeV/c2 and 5919.77±0.08(stat)±0.02(syst)±0.66(Λb0mass)MeV/c2. The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally excited Λb0 baryons, Λb*0(5912) and Λb*0(5920).
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2012
- DOI:
- 10.1103/PhysRevLett.109.172003
- arXiv:
- arXiv:1205.3452
- Bibcode:
- 2012PhRvL.109q2003A
- Keywords:
-
- 14.20.Mr;
- 13.30.Eg;
- 13.60.Rj;
- Bottom baryons;
- Hadronic decays;
- Baryon production;
- High Energy Physics - Experiment
- E-Print:
- Replaced by version published in Phys. Rev. Lett, modified fit with better mass resolution treatment