Observation of New Ξc0 Baryons Decaying to Λc+K-
Abstract
The Λc+K- mass spectrum is studied with a data sample of p p collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb-1 collected by the LHCb experiment. Three Ξc0 states are observed with a large significance and their masses and natural widths are measured to be m [Ξc(2923 )0]=2923.04 ±0.25 ±0.20 ±0.14 MeV , Γ [Ξc(2923 )0]=7.1 ±0.8 ±1.8 MeV , m [Ξc(2939 )0]=2938.55 ±0.21 ±0.17 ±0.14 MeV , Γ [Ξc(2939 )0]=10.2 ±0.8 ±1.1 MeV , m [Ξc(2965 )0]=2964.88 ±0.26 ±0.14 ±0.14 MeV , Γ [Ξc(2965 )0]=14.1 ±0.9 ±1.3 MeV , where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λc+ mass. The Ξc(2923 )0 and Ξc(2939 )0 baryons are new states. The Ξc(2965 )0 state is in the vicinity of the known Ξc(2970 )0 baryon; however, their masses and natural widths differ significantly.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevLett.124.222001
- Bibcode:
- 2020PhRvL.124v2001A