Measurement of the production rates of η and η′ in hadronic Z decays

• Published in: Physics letters. B 1992-10, Vol.292 (1), p.210-220
• Main Authors: Buskulic, D., Ariztizabal, F., Comas, P., Pascual, A., Farilla, A., Maggi, G., Ruggieri, F., Silvestris, L., Hu, H., Lin, J., Wang, T., Xu, D., Jacobsen, R., Lançon, E., Lohse, T., Lusiani, A., Meyer, T., Ranjard, F., Rothberg, J., Witzeling, W., Bardadin-Otwinowska, M., El Fellous, R., Falvard, A., Henrard, P., Jousset, J., Michel, B., Montret, J.-C., Pietrzyk, B., Møllerud, R., Nilsson, B.S., Simopoulou, E., Orteu, S., Rosowsky, A., Candlin, D.J., Bencivenni, G., Bologna, G., D'Ettorre-Piazzoli, B., Mannocchi, G., Pepe-Altarelli, M., Boyle, O., Maitland, W., Smith, K., Thompson, A.S., Rensch, B., Tittel, K., Cattaneo, M., Lieske, N.M., Payne, D.G., Sedgbeer, J.K., Kneringer, E., Patel, A., Carr, J., Drinkard, J., Papalexiou, S., Brown, D., Dydak, F., Halley, A.W., Lauber, J., Männer, W., Richter, R., Stiegler, U., Bertin, V., Chen, X., Cordier, A., Grivaz, J.-F., Zomer, F., Amendolia, S.R., Bosisio, L., Dell'Orso, R., Foà, L., Forti, F., Rizzo, G., Tenchini, R., Tonelli, G., Triggiani, G., Verdini, P.G., Green, M.G., March, P.V., Mir, Ll.M., Medcalf, T., Botterill, D.R., Edgecock, T.R., Edwards, M., Jones, T.J., Kozanecki, W., Roussarie, A., Schuller, J.-P., Si Mohand, D., Vallage, B., Litke, A.M., Taylor, G., Booth, C.N., Carney, R.E., Reeves, P., Schäfer, U., Gobbo, B., Cinabro, D., Gao, Y.S., Pater, J.R., Whitney, M.H.
• Format: Article
• Language: English
• Subjects: Classical and quantum physics: mechanics and fields; Exact sciences and technology; High Energy Physics - Experiment; Physics; Theory of quantized fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(92)90633-F

The decays η → γγ and η′ → ηπ + π − have been observed in hadronic decays of the Z produced at LEP. The fragmentation functions of both the η and η′ have been measured. The measured multiplicities for x > 0.1 are 0.298±0.023±0.021 and 0.068±0.016 for η and η′ respectively. While the fragmentation function for the η is fairly well described by the JETSET Monte Carlo, it is found that the production rate of the η′ is a factor of four less than the corresponding prediction.