Inclusive J, ψ' and χc production in hadronic Z decays

Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1997) Inclusive J, ψ' and χc production in hadronic Z decays Physics Letters B, 407 (3-4). pp. 351-360. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0370-2693(97)00790-9

Abstract

We report on measurements of the inclusive production of J, ψ' and χc mesons in hadronic Z decays, based on 3.2 million hadronic events collected using the L3 detector at LEP. The J and ψ mesons are reconstructed through their decays into lepton pairs, while the χc mesons are reconstructed via the decay mode χc→J + γ. The measured branching fractions are: Br(Z → J + X) = (3.40 ± 0.23 (stat.) ± 0.27 (sys.)) × 10-3, Br(Z → ψ' + X) = (1.6 ± 0.5 (stat.) ± 0.3 (sys.)) × 10-3, Br(Z →χc1 + X) = (2.7 ± 0.6 (stat.) ± 0.5 (sys.)) × 10-3. In the absence of a clear χc2 signal, the upper limit at 90% C.L. is set: Br(Z →χc2 + X) < 3.2 × 10-3.

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