Inclusive production of the η and ω mesons in Z decays, and the muonic branching ratio of the ω Arno 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 , Erik J Fernandez , M Fernandezbosman , L Garrido , E Grauges , Mario Martinez , G 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 , F Ruggieri , G Selvaggi , L Silvestris , P Tempesta , A Tricomi , G Zito , X Huang , Jian Lin , Q Ouyang , Ting Wang , Y Xie , R Xu , S Xue , Jun Zhang , L Zhang , Weihong Zhao , D Abbaneo , P Azzurri , O Buchmuller , M Cattaneo , F Cerutti , Barbara Clerbaux , H Drevermann , R Forty , M Frank , F Gianotti , T C Greening , J Harvey , D E Hutchcroft , P Janot , B Jost , M Kado , P Mato , A Moutoussi , F Ranjard , L Rolandi , D Schlatter , O Schneider , G Sguazzoni , W Tejessy , F Teubert , A Valassi , I Videau , J D Ward , F Badaud , A Falvard , P Gay , P Henrard , J Jousset , B Michel , S Monteil , J C Montret , D Pallin , P Perret , J R Hansen , P H Hansen , B S Nilsson , A Waananen , A Kyriakis , C Markou , E Simopoulou , A Vayaki , K Zachariadou , A Blondel , G R Bonneaud , J C Brient , A Rouge , M Rumpf , M Swynghedauw , M Verderi , H Videau , V Ciulli , E Focardi , G Parrini , A Antonelli , M Antonelli , G Bencivenni , G Bologna , F Bossi , P Campana , G Capon , V Chiarella , P Laurelli , G Mannocchi , F Murtas , G P Murtas , L Passalacqua , M Pepealtarelli , Paolo Spagnolo , A W Halley , J G Lynch , P Negus , Val Oshea , C Raine , A S Thompson , S Wasserbaech , Richard Cavanaugh , S Dhamotharan , C Geweniger , P Hanke , G Hansper , V Hepp , E E Kluge , A Putzer , J Sommer , K Tittel , S G Werner , M Wunsch , R Beuselinck , D M Binnie , W Cameron , P J Dornan , M Girone , N Marinelli , J K Sedgbeer , J C Thompson , V M Ghete , P Girtler , E Kneringer , D Kuhn , G Rudolph , E V Bouhovathacker , C K Bowdery , A J Finch , F Foster , G Hughes , R W L Jones , M R Pearson , N A Robertson , K Jakobs , K Kleinknecht , G Quast , B Renk , H G Sander , H Wachsmuth , C Zeitnitz , A Bonissent , John P Carr , P Coyle , O Leroy , P Payre , D Rousseau , M Talby , F Ragusa , A David , H Dietl , G Ganis , K Huttmann , G Lutjens , C Mannert , W Manner , H G Moser , R Settles , H Stenzel , W Wiedenmann , G Wolf , J Boucrot , O Callot , M Davier , L Duflot , J F Grivaz , P Heusse , A Jacholkowska , J Lefrancois , J J Veillet , C Yuan , G Bagliesi , T Boccali , L Foa , Andrea Giammanco , A Giassi , F Ligabue , A Messineo , F Palla , G Sanguinetti , A Sciaba , R Tenchini , A Venturi , P G Verdini , G A Blair , G Cowan , M G Green , T Medcalf , A Misiejuk , J A Strong , P Teixeiradias , J H Von Wimmerspergtoeller , R W Clifft , T R Edgecock , P R Norton , I R Tomalin , B Blochdevaux , P Colas , S Emery , W Kozanecki , E Lancon , M C Lemaire , E Locci , P Perez , J Rander , J F Renardy , A Roussarie , J P Schuller , J Schwindling , A Trabelsi , B Vallage , N Konstantinidis , A M Litke , G P Taylor , A J Beddall , C N Booth , S Cartwright , F Combley , M H Lehto , L F Thompson , K Affholderbach , A Bohrer , Scott A Brandt , C Grupen , A Ngac , G Prange , U Sieler , G Giannini , J Rothberg , S R Armstrong , K Berkelman , K Cranmer , D Ferguson , Yuanyuan Gao , S Gonzalez , O J Hayes , H Hu , S Jin , J Kile , P A Mcnamara , J E Nielsen , Y B Pan , J Wu , Sau Lan Wu , Xiaohong Wu , G Zobernig , Gunther Dissertori PHYSICS LETTERS B（2002）
摘要
The inclusive production of the eta and omega(782) mesons is measured in the pi(+)pi(-)pi(0) 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 eta production rate for x(rho) p(meson)/p(beam) > 0.10 is found to be 0.355 +/- 0.01(stat) +/- 0.024(sys) per event, and the omega production rate for x(p) > 0.05 is measured as 0.585 +/- 0.019(stat) +/- 0.033(sys) per event. The branching ratio for omega --> mu(+)mu(-) 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 +/- 2.9(stat) 1.1(sys)) x 10(-5). (C) 2002 Elsevier Science B.V. All rights reserved.
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