Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π-J/ψ Decays
Abstract
We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B±→K±π+π-J/ψ. This state, which decays into π+π-J/ψ, has a mass of 3872.0±0.6(stat)±0.5(syst) MeV, a value that is very near the MD0+MD*0 mass threshold. The results are based on an analysis of 152M B-B¯ events collected at the ϒ(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10σ.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2003
- DOI:
- 10.1103/PhysRevLett.91.262001
- arXiv:
- arXiv:hep-ex/0309032
- Bibcode:
- 2003PhRvL..91z2001C
- Keywords:
-
- 14.40.Gx;
- 12.39.Mk;
- 13.20.He;
- Mesons with S=C=B=0 mass>2.5 GeV;
- Glueball and nonstandard multi-quark/gluon states;
- Decays of bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- 10 pages 4 figures, submitted to Physical Review Letters