Inclusive Charmonium production in hadronic Z decays in L3 at LEP

We report on measurements of the inclusive production of J/ψ, ψ' and χc mesons in hadronic Z decays, based on 3.2 million hadronic events collected using the L3 detector at LEP. The J/ψ and ψ' mesons are reconstructed through their decays into lepton pairs, while the χc mesons are reconstructed via the decay mode χc→J/ψ+γ. The measured branching fractions are: Br(Z→Jψ+X)=(3.40±0.23(stat.)±0.27(sys.))x10-3 Br(Z→ψ'+X)=(1.6±0.5(stat.)±0.3(sys.))x10-3 Br(Z→χc1+X)=(2.7±0.6(stat.)±0.5(sys.))x10-3. In the absence of a clear χc2 signal, we set the upper limit at 90% CL: Br(Z→χc2+X)<3.2x10-3