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Adye, T.; Amaldi, U.; Amato, S.; Antilogus, P.; Arnoud, Y.; Bambade, P.; Bates, M. J.; Baubillier, M.; Becks, K -H.; Belous, K.; Benvenuti, A. C.; Bosio, C.; Bourdarios, C.; Branchini, P.; Brown, R. C. A.; Bugge, L.; Buran, T.; Buschmann, P.; Caccia, M.; Chaussard, L.; Chorowicz, V.; Cindro, V.; Colomer, M.; Cosme, G.; Cuevas Maestro, J.; Dauncey, P. D.; Deghorain, A.; De Angelis, A.; De Min, A.; Dolbeau, J.; Doroba, K.; Drees, K. -A.; Durand, J -D.; Elsing, M.; Engel, J -P.; Falk, E.; Franek, B.; Gasparini, U.; Goncalves, P.; Grefrath, A.; Herr, H.; Jalocha, P.; Jarry, P.; Jean-Mariels, B.; Katsanevas, S.; Klapp, O.; Kluit, P.; Krammer, M.; Krstic, J.; Langefeld, P.; Laugier, J -P.; Leisos, A.; Leitner, R.; Lemonne, J.; Lethuillier, M.; Loken, J. G.; Loukas, D.; Mandl, F.; Margoni, M.; Martinez-Rivero, C.; Moeller, R.; Myatt, G.; Nielsen, B. S.; Normand, A.; Nygren, A.; Oberschulte-Beckmann, W.; Olshevski, A. G.; Passeri, A.; Peralta, L.; Phillips, H. T.; Piotto, E.; Pullia, A.; Radojicic, D.; Ragazzi, S.; Rahmani, H.; Resvanis, L. K.; Rinaudo, G.; Ronchese, P.; Rovelli, T.; Sacquin, Y.; Seager, P.; Sekulin, R.; Shellard, R. C.; Skaali, T. B.; Strauss, J.; Strub, R.; Todorov, T.; Toet, D. Z.; Tomaradze, A.; Trombini, A.; Troncon, C.; Tsirou, A.; Ullaland, O.; Van Doninck, W. K.; Vegni, G.; Vilanova, D.; Waldner, F.; Wetherell, A. M.; Williams, W. S. C.; Zucchelli, G. C.
The European physical journal. C, Particles and fields, 03/1998, Letnik: 1, Številka: 1-2Journal Article
An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/c2, the lower limit at 95% confidence level on the chargino mass ranges from 84.3 GeV/c2 to the kinematical limit (86.0 GeV/c2), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass differences. The limit in the case of a light sneutrino is 67.6 GeV/c2, provided that that there is no light sneutrino with a mass within 10 GeV/c2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a picobarn are derived. The (μ,M2) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino. imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino.
