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

A. Heister, S. Schael, R. Barate, I. De Bonis, D. Decamp, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, G. Boix, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugés, M. MartinezG. Merino, R. Miquel, Ll M. Mir, A. Pacheco, H. Ruiz, A. Colaleo, D. Creanza, M. De Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso

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12 Citations (Scopus)


The inclusive production of the η and ω(782) mesons is measured in the π+π-π0 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 ω → μ+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(ω → μ+μ-) = (9.0 ± 2.9stat ± 1.1sys) × 10-5. © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)19-33
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 28 Feb 2002


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