Elsevier

Physics Letters B

Volume 528, Issues 1–2, 28 February 2002, Pages 19-33
Physics Letters B

Inclusive production of the η and ω mesons in Z decays, and the muonic branching ratio of the ω

https://doi.org/10.1016/S0370-2693(02)01220-0Get rights and content
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Abstract

The inclusive production of the η and ω(782) mesons is measured in the π+ππ0 decay mode in hadronic Z decays 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 η production rate for xp=pmeson/pbeam>0.10 is found to be 0.355±0.011stat±0.024sys per event, and the ω production rate for xp>0.05 is measured as 0.585±0.019stat±0.033sys per event. The branching ratio for ωμ+μ 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(ωμ+μ)=(9.0±2.9stat±1.1sys)×10−5.

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Supported by CICYT, Spain.

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Permanent address: Universitat de Barcelona, 08208 Barcelona, Spain.

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Now at LBNL, Berkeley, CA 94720, USA.