Inclusive production of the eta and omega mesons in Z decays, and the muonic branching ratio of the omega

Heister, A; Schael, S; Barate, R; De Bonis, I; Decamp, D; Goy, C; Lees, Jp; Merle, E; Minard, Mn; Pietrzyk, B; Boix, G; Bravo, S; Casado, Mp; Chmeissani, M; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Pacheco, A; Ruiz, H; Colaleo, A; Creanza, D; de Palma, M; Iaselli, G; Maggi, G; Maggi, M; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; R, Xu; Xue, S; Zhang, J; Zhang, L; Zhao, W; Abbaneo, D; Azzurri, P; Buchmuller, O; Cattaneo, M; Cerutti, F; Clerbaux, B; Drevermann, H; Forty, Rw; Frank, M; Gianotti, F; Greening, Tc; Hansen, Jb; Harvey, J; Hutchcroft, De; Janot, P; Jost, B; Kado, M; Mato, P; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schneider, O; Sguazzoni, G; Tejessy, W; Teubert, F; Valassi, A; Videau, I; Ward, J; Badaud, F; Falvard, A; Gay, P; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, R; Hansen, Jd; Hansen, Jr; Hansen, Ph; Nilsson, Bs; Waananen, A; Kyriakis, A; Markou, C; Simopoulou, E; Vayaki, A; Zachariadou, K; Blondel, A; Bonneaud, G; Brient, Jc; Rouge, A; Rumpf, M; Swynghedauw, M; Verderi, M; Videau, H; Ciulli, V; Focardi, E; Parrini, G; Antonelli, A; Antonelli, M; Bencivenni, G; Bologna, G; Bossi, E; Campana, P; Capon, G; Chiarella, V; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Spagnolo, P; Halley, A; Lynch, Jg; Negus, P; O'Shea, V; Raine, C; Thompson, As; Wasserbaech, S; Cavanaugh, R; Dhamotharan, S; Geweniger, C; Hanke, R; Hansper, G; Hepp, V; Kluge, Ee; Putzer, A; Sommer, J; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, Dm; Cameron, W; Dornan, R; Girone, M; Marinelli, N; Sedgbeer, Jk; Thompson, Jc; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bouhova Thacker, E; Bowdery, Ck; Finch, Aj; Foster, F; Hughes, G; Rwl, Jones; Pearson, Mr; Robertson, Na; Jakobs, K; Kleinknecht, K; Quast, G; Renk, B; Sander, Hg; Wachsmuth, H; Zeitnitz, C; Bonissent, A; Carr, J; Coyle, P; Leroy, O; Payre, P; Rousseau, D; Talby, M; Ragusa, F; David, A; Dietl, H; Ganis, G; Huttmann, K; Lutjens, G; Mannert, C; Manner, W; Moser, Hg; Settles, R; Stenzel, H; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Lefrancois, J; Veillet, Jj; Yuan, C; Bagliesi, G; Boccali, T; Foa, L; Giammanco, A; Giassi, A; Ligabue, F; Messineo, ALBERTO MARIA; Palla, F; Sanguinetti, G; Sciaba, A; Tenchini, R; Venturi, A; Verdini, Pg; Blair, Ga; Cowan, G; Green, Mg; Medcalf, T; Misiejuk, A; Strong, Ja; Teixeira Dias, P; von Wimmersperg Toeller JH,; Clifft, Rw; Edgecock, Tr; Norton, Pr; Tomalin, Ir; Lancon, E; Lemaire, Mc; Locci, E; Perez, P; Rander, J; Renardy, Jf; Roussarie, A; Schuller, Jp; Schwindling, J; Trabelsi, A; Vallage, B; Konstantinidis, N; Litke, Am; Taylor, G; Beddall, A; Booth, Cn; Cartwright, S; Combley, F; Lehto, M; Thompson, Lf; Affholderbach, K; Bohrer, A; Brandt, S; Grupen, C; Ngac, A; Prange, G; Sieler, U; Giannini, G; Rothberg, J; Armstrong, Sr; Berkelman, K; Cranmer, K; Dps, Ferguson; Gao, Y; Gonzalez, S; Hayes, Oj; H, Hu; Jin, S; Kile, J; Mcnamara, Pa; Nielsen, J; Pan, Yb; von Wimmersperg Toeller JH,; Wiedenmann, W; J, Wu; Sl, Wu; X, Wu; Zobernig, G; Dissertori, G.

doi:10.1016/S0370-2693(02)01220-0

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.