Measurement of Δ++(1232) production in hadronic Z decays

• Published in: Physics letters. B Vol. 361; no. 1; pp. 207 - 220
• Main Authors: Abreu, P., Aleksan, R., Almehed, S., Alvsvaag, S.J., Amaldi, U., Andrieux, M.L., Apel, W-D., Barao, F., Bolognese, T., Bozzo, M., Bruckman, P., Burgsmueller, T., Buschmann, P., Caccia, M., Camporesi, T., Cerrito, L., Chabaud, V., Charpentier, Ph, Chaussard, L., Chelkov, G.A., Chliapnikov, P., Cindro, V., Crennell, D., Dahl-Jensen, E., De Saint-Jean, C., Djama, F., Engel, J-P., Fassouliotis, D., Filippas, T.A., Fries, D.C., Gibbs, M., Gokieli, R., Gunther, M., Harris, F.J., Hernandez, J.J., Hilke, H.J., Holmgren, S-O., Jalocha, P., Jarry, P., Jonsson, L., Khomenko, B.A., King, B., Klovning, A., Koene, B., Kostioukhine, V., Laugier, J-P., Leitner, R., Lenzen, G., Liko, D., Lindner, R., Marechal, B., Matthiae, G., Mc Kay, R., Meroni, C., Meyer, W.T., Moeller, R., Mundim, L.M., Myatt, G., Negri, P., Nemecek, S., Neumeister, N., Niss, P., Parkes, C., Parodi, F., Petridou, C., Phillips, H.T., Podobrin, O., Poropat, P., Privitera, P., Rahmani, H., Redaelli, N.G., Roncagliolo, I., Rosenberg, E.I., Rovelli, T., Rybin, A., Saarikko, H., Sajot, G., Sannino, M., Seager, P., Seitz, A., Shellard, R.C., Sitar, B., Smadja, G., Squarcia, S., Stavitski, I., Stugu, B., Tilquin, A., Toet, D.Z., Trombini, A., Troncon, C., Tyndel, M., Vander Velde, C., Van Eldik, J., Vassilopoulos, N., Ventura, L., Verbeure, F., Vitale, L., Vodopyanov, A.S., Zevgolatakos, E., Zhigunov, V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 02.11.1995; Elsevier
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(95)01176-Q

A measurement of the Δ ++(1232) inclusive production in hadronic decays of the Z at LEP is presented, based on 1.3 million hadronic events collected by the DELPHI detector in the 1994 LEP running period. The DELPHI ring imaging Cherenkov counters are used for identifying hadrons. The average Δ ++(1232) multiplicity per hadronic event is 0.079 ± 0.015 which is more than a factor of two below the JETSET, HERWIG and UCLA model predictions. It agrees with a recently proposed universal mass dependence of particle production rates in e + e − annihilations.