Observation of the Decay Ω0c-->Ω- e+νe
Abstract
Using the CLEO detector at the Cornell Electron Storage Ring we have observed the Ω0c (css ground state) in the decay Ω0c-->Ω- e+νe. We find a signal of 11.4+/-3.8(stat) events. The probability that we have observed a background fluctuation is 7.6×10-5. We measure B(Ω0c-->Ω- e+νe).σ(e+e- -->Ω0cX)=(42.2+/-14.1(stat)+/-5.7(syst)) fb and R=Γ(Ω0c-->Ω- π+)Γ(/Ω0c-->Ω- eνe)=00.41+/-0.19(stat)+/-0.04(syst). This is the first statistically significant observation of an individual decay mode of the Ω0c in e+e- annihilation and the first example of a baryon decaying via β emission, where no quarks from the first generation participate in the reaction.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2002
- DOI:
- 10.1103/PhysRevLett.89.171803
- arXiv:
- arXiv:hep-ex/0207078
- Bibcode:
- 2002PhRvL..89q1803A
- Keywords:
-
- 13.30.Ce;
- 14.20.Lq;
- 14.65.Dw;
- Leptonic semileptonic and radiative decays;
- Charmed baryons;
- Charmed quarks;
- High Energy Physics - Experiment
- E-Print:
- 10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRL