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Abdallah, J; Adam, W; Albrecht, T; Alemany-Fernandez, R; Allport, P; Amaldi, U; Andringa, S; Antilogus, P; Apel, WD; Asman, B; Baillon, P; Ballestrero, A; Barbier, R; Begalli, M; Benekos, N; Bloch, D; Blom, M; Bonesini, M; Botner, O; Boyko, I; Brenner, R; Brodet, E; Bruckman, P; Brunet, M; Calvi, M; Camporesi, T; Castro, N; Checchia, P; De Angelis, A; De Min, A; Doroba, K; Dris, M; Eigen, G; Santo, CE; Ferrer, A; Flagmeyer, U; Foeth, H; Gandelman, M; Garcia, C; Golob, B; Gomez-Ceballos, G; Grosdidier, G; Grzelak, K; Haag, C; Hedberg, Vincent; Hennecke, M; Herr, H; Hultqvist, K; Johansson, K; Joram, C; Katsanevas, S; Kluit, P; Kouznetsov, O; Lamsa, J; Lepeltier, V; Loukas, D; Maltezos, S; Marco, J; Matteuzzi, C; Mjörnmark, Ulf; Moraes, D; Muryn, B; Nicolaidou, R; Oblakowska-Mucha, A; Obraztsov, V; Olshevski, A; Orava, R; Ouraou, A; Paganoni, M; Paiano, S; Pape, L; Parodi, F; Passeri, A; Perrotta, A; Polok, G; Pozdniakov, V; Ramler, L; Rehn, J; Rivero, M; Romero, A; Roudeau, P; Savoy-Navarro, A; Sisakian, A; Sosnowski, R; Spassov, T; Tegenfeldt, F; Tkatchev, L; Tortosa, P; Travnicek, P; Treille, D; Troncon, C; Van Eldik, J; Van Vulpen, I; Vegni, G; Veloso, F; Verdier, P; Vilanova, D; Wickens, J; Yushchenko, O; Zupan, M
The European physical journal. C, Particles and fields, 01/2005, Letnik: 38, Številka: 4Journal Article
Hadronic events from the data collected with the DELPHI detector at LEP within the energy range from 89 GeV to 209 GeV are selected, their jet rates are determined and compared to predictions of four different event generators. One of them is the recently developed APACIC++ generator which performs a massive matrix element calculation matched to a parton shower followed by string fragmentation. The four-jet rate is used to measure alpha(s) in the next-to-leading-order approximation yielding alpha(s)(M-Z(2)) = 0.1175 +/- 0.0030. The running of alpha(s) determined by using four-jet events has been tested. The logarithmic energy slope is measured to be dalpha(s)(-1)/d log E-cm = 1.14 +/- 0.36. Since the analysis is based on four-jet final states it represents an alternative approach to previous DELPHI alpha(s) measurements using event shape distributions.
