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Test of colour reconnection models using three-jet events in hadronic Z decays

  • Autori: Schael, S.; Barate, R.; Brunelie, ; Re, R.; DE BONIS, I.; Decamp, D.; Goy, C.; Je, Z.; Quel, S.; Lees, J.; Martin, F.; Merle, E.; Minard, M.; Pietrzyk, B.; Trocme, B.; Bravo, S.; Casado, M.; Chmeissani, M.; Crespo, J.; Fernandez, E.; FERNANDEZ BOSMAN, M.; Garrido, L.; Martinez, M.; Pacheco, A.; Ruiz, H.; Colaleo, A.; Creanza, D.; DE FILIPPIS, N.; 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.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Barklow, T.; Buchmu, ; Ller, O.; Cattaneo, M.; Clerbaux, B.; Drevermann, H.; Forty, R.; Frank, M.; Gianotti, F.; Hansen, J.; Harvey, J.; Hutchcroft, D.; Janot, P.; Jost, B.; Kado, M.; Mato, P.; Moutoussi, A.; Ranjard, F.; Rolandi, L.; Schlatter, D.; Teubert, F.; Valassi, A.; Videau, I.; Badaud, F.; Dessagne, S.; Falvard, A.; Fayolle, D.; Gay, P.; Jousset, J.; Michel, B.; Monteil, S.; Pallin, D.; Pascolo, J.; Perret, P.; Hansen, J.; Hansen, J.; Hansen, P.; Kraan, A.; Nilsson, B.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Vayaki, A.; Zachariadou, K.; Blondel, A.; Brient, J.; Machefert, F.; Rouge, A.; Videau, H.; Ciulli, V.
  • Anno di pubblicazione: 2006
  • Tipologia: Articolo in rivista (Articolo in rivista)
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Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one implemented in JETSET (the GAL model), the other in ARIADNE, are too high and disfavoured by the data, whereas the rates from the corresponding non-CR standard versions of these generators are too low. The data can be described by the GAL model assuming a small value for the R(0) parameter in the range 0.01-0.02.