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

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

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>0.1...

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Veröffentlicht in:Physics letters. B 2002-02, Vol.528 (1-2), p.19-33
Hauptverfasser: Merle, E., Boix, G., Fernandez, E., Ruiz, H., Colaleo, A., de Palma, M., Maggi, M., Nuzzo, S., Ruggieri, F., Silvestris, L., Tempesta, P., Xie, Y., Zhang, J., Zhang, L., Azzurri, P., Buchmüller, O., Drevermann, H., Frank, M., Gianotti, F., Jost, B., Mato, P., Ranjard, F., Rolandi, L., Ward, J., Gay, P., Jousset, J., Pallin, D., Hansen, J.R., Hansen, P.H., Nilsson, B.S., Markou, C., Brient, J.-C., Verderi, M., Focardi, E., Bencivenni, G., Mannocchi, G., Spagnolo, P., Halley, A., O'Shea, V., Raine, C., Thompson, A.S., Hansper, G., Hepp, V., Werner, S., Wunsch, M., Binnie, D.M., Sedgbeer, J.K., Thompson, J.C., Girtler, P., Kuhn, D., Bouhova-Thacker, E., Finch, A.J., Hughes, G., Jones, R.W.L., Renk, B., Sander, H.-G., Wachsmuth, H., Carr, J., Coyle, P., Leroy, O., Rousseau, D., Talby, M., Mannert, C., Settles, R., Davier, M., Duflot, L., Foà, L., Giassi, A., Ligabue, F., Messineo, A., Sanguinetti, G., Tenchini, R., Venturi, A., Cowan, G., Green, M.G., Misiejuk, A., Strong, J.A., von Wimmersperg-Toeller, J.H., Tomalin, I.R., Colas, P., Emery, S., Lemaire, M.-C., Renardy, J.-F., Schwindling, J., Konstantinidis, N., Taylor, G., Beddall, A., Combley, F., Thompson, L.F., Böhrer, A., Prange, G., Armstrong, S.R., Berkelman, K., Gao, Y., Jin, S., Kile, J., Nielsen, J., Pan, Y.B., Wu, J., Wu, Sau Lan
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(02)01220-0