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    Heister, A.; Schael, S.; Barate, R.; Bruneliere, R.; de Bonis, I.; Decamp, D.; Goy, C.; Jezequel, S.; Lees, J P.; Martin, F.; Merle, E.; Minard, M N.; Pietrzyk, B.; Trocme, B.; Boix, G.; Bravo, S.; Casado, M P.; Chmeissani, M.; Crespo, J M.; Fernandez, E.; Fernandez-Bosman, M.; Garrido, L.; Grauges, E.; Lopez, J.; Martinez, M.; Merino, G.; Pacheco, A.; Paneque, D.; 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, Jiali; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Azzurri, P.; Barklow, T.; Buchmuller, O.; Cattaneo, M.; Cerutti, F.; Clerbaux, B.; Drevermann, H.; Forty, R W.; Frank, M.; Gianotti, F.; Greening, T C.; Hansen, J B.; Harvey, J.; Hutchcroft, D E.; Janot, P.; Jost, B.; Kado, M.; Mato, P.; Moutoussi, A.; Ranjard, F.; Rolandi, L.; Schlatter, D.; Sguazzoni, G.; Tejessy, W.; Teubert, F.; Valassi, A.; Videau, I.; Ward, J J.; Badaud, F.; Dessagne, S.; Falvard, Alain; Fayolle, D.; Gay, Pascal; Jousset, J.; Michel, B.; Monteil, S.; Pallin, D.; Pascolo, J M.; Perret, Pascal; Hansen, J D.; Hansen, J R.; Hansen, P H.; Nilsson, B S.; Kyriakis, A.

    Physics letters. B, 2002, Letnik: 543
    Journal Article

    Single top production via the flavour changing neutral current reactions e+e- -> \bar{t}c , \bar{t}u is searched for within the 214~pb-1 of data collected by ALEPH at centre-of-mass energies between 204 and 209~GeV. No deviation from the Standard Model expectation is observed and upper limits on the single top production cross sections are derived. The combination with data collected at lower centre-of-mass energies yields an upper limit on the branching ratio BR(t -> Zc)+BR(t -> Zu) 14%, for BR(t -> \gamma c)+BR(t -> \gamma u)= 0 and mt=174 GeV/c2$.