Inclusive Production of the omega and eta Mesons in Z Decays, and the Muonic Branching Ratio of the omega
Abstract
The inclusive production of the omega(782) vector meson in hadronic Z decays is measured and compared to model predictions. The analysis is based on 4 million hadronic Z decays recorded by the ALEPH detector between 1991 and 1995. The production rate for xp = pmeson/pbeam > 0.05 is measured in the omega -> pi+ pi- pi0 decay mode and found to be 0.585 +- 0.019stat +- 0.033sys per event. Inclusive eta meson production is also measured in the same decay channel for xp > 0.10, obtaining 0.355 +- 0.011stat +- 0.024sys per event. The branching ratio for omega -> mu+ mu- is investigated. A total of 18.1 +- 5.9 events are observed, from which the muonic branching ratio is measured for the first time to be BR(omega -> mu+ mu-) = (9.0 +- 2.9stat +- 1.1sys)*10-5.
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