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Search for charginos and neutralinos in $e^+ e^-$ collisions at centre-of-mass energies near 183 GeV and constraints on the MSSM parameter space

By R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J.P. Lees, F. Martin, E. Merle, M.N. Minard, J.Y. Nief, B. Pietrzyk, R. Alemany, M P. Casado, M. Chmeissani, JM. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Graughs, A. Juste, M. Martmnez, G. Merino, R. Miquel, L M. Mir, P. Morawitz, A. Pacheco, I C. Park, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. De Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, A. Tricomi, G. Zito, X. Huang, Jiali Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, G. Boix, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R W. Forty, M. Frank, F. Gianotti, A W. Halley, J B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, C. Loomis, P. Maley, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I R. Tomalin, E. Tournefier, M. Vreeswijk, Ziad Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, S. Dessagne, Alain Falvard, C. Ferdi, Pascal Gay, C. Guicheney, Pierre Henrard, J. Jousset, B. Michel, S. Monteil, Jean-Claude Montret, D. Pallin, Pascal Perret, F. Podlyski, J D. Hansen, J R. Hansen, P H. Hansen, B S. Nilsson, B. Rensch, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, JC. Brient, F. Machefert, A. Rougi, M. Swynghedauw, R. Tanaka, A. Valassi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, R. Cavanaugh, M. Corden, C. Georgiopoulos, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G P. Murtas, L. Passalacqua, M. Pepi-Altarelli, M. Chalmers, L. Curtis, J G. Lynch, P. Negus, V. O'Shea, B. Raeven, C. Raine, D. Smith, P. Teixeira-Dias, A S. Thompson, J J. Ward, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E E. Kluge, A. Putzer, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D M. Binnie, W. Cameron, P J. Dornan, M. Girone, S. Goodsir, N. Marinelli, E B. Martin, J. Nash, J. Nowell, J K. Sedgbeer, P. Spagnolo, E. Thomson, M D. Williams, V M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, A P. Betteridge, C K. Bowdery, P G. Buck, P. Colrain, G. Crawford, G. Ellis, A J. Finch, F. Foster, G. Hughes, R W L. Jones, N A. Robertson, M. Williams, P. Van Gemmeren, I. Giehl, F. Hvlldorfer, C. Hoffmann, K. Jakobs, K. Kleinknecht, M. Krvcker, G. Quast, B. Renk, E. Rohne, H G. Sander, S. Schmeling, H. Wachsmuth, C. Zeitnitz, T. Ziegler, J.J. Aubert, C. Benchouk, A. Bonissent, J. Carr, P. Coyle, A. Ealet, D. Fouchez, F. Motsch, P. Payre, M. Talby, M. Thulasidas, A. Tilquin, M. Aleppo, M. Antonelli, F. Ragusa, R. Berlich, H. Dietl, G. Ganis, C. Mannert, W. Mdnner, H G. Moser, S. Schael, R. Settles, H. Seywerd, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, S. Chen, M. Davier, L. Duflot, J F. Grivaz, P. Heusse, A. Jacholkowska, M. Kado, D W. Kim, J. Lefrangois, L. Serin, J J. Veillet, I. Videau, J B. DeVivie De Rigie, D. Zerwas, P. Azzurri, G. Bagliesi, S. Bettarini, T. Boccali, C. Bozzi, G. Calderini, R. Dell'Orso, R. Fantechi, I. Ferrante, A. Giassi, A. Gregorio, F. Ligabue, A. Lusiani, P S. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, G. Sguazzoni, R. Tenchini, C. Vannini, A. Venturi, P G. Verdini, G A. Blair, J T. Chambers, J. Coles, G. Cowan, M G. Green, D E. Hutchcroft, L T. Jones, T. Medcalf, J A. Strong, J H. Von Wimmersperg-Toeller, D R. Botterill, R W. Clifft, T R. Edgecock, P R. Norton, J C. Thompson, A E. Wright, B. Bloch-Devaux, P. Colas, B. Fabbro, G. Faof, E. Langon, M C. Lemaire, E. Locci, P. Pirez, H. Przysiezniak, J. Rander, J F. Renardy, A. Rosowsky, A. Trabelsi, B. Tuchming, B. Vallage, S N. Black, J H. Dann, H Y. Kim, N. Konstantinidis, A M. Litke, M A. McNeil, G. Taylor, C N. Booth, S L. Cartwright, F. Combley, PN. Hodgson, M S. Kelly, M H. Lehto, L F. Thompson, K. Affholderbach, A. Bvhrer, S. Brandt, J. Foss, C. Grupen, A. Misiejuk, G. Prange, U. Sieler, L. Smolik, F. Stephan, G. Giannini, J. Putz, J E. Rothberg, S. Wasserbaech, R W. Williams, S R. Armstrong, E. Charles, P. Elmer, D P S. Ferguson, Y. Gao, S. Gonzalez, T C. Greening, O J. Hayes, H. Hu, S. Jin, G. Mamier, P A. McNamara, J M. Nachtman, J. Nielsen, W. Orejudos, Y B. Pan, Y. Saadi, I J. Scott, M. Vogt, J. Walsh, S L. Wu, X. Wu and G. Zobernig

Abstract

Searches for charginos and neutralinos are performed with the data collected by the ALEPH detector at LEP at centre-of-mass energies near 183 GeV. In these searches, it is assumed that R-parity is conserved and that the lightest neutralino is the LSP. No evidence of a signal is observed in the 57 pb-1 accumulated, which excludes chargino and associated neutralino production up to the kinematic limit over large regions of the MSSM parameter space. Under the assumptions of common gaugino and common sfermion masses at the unification scale, the interplay between the chargino, neutralino and slepton exclusions allows a lower limit of 27 GeV/c2 to be set on the mass of the lightest neutralino. Tighter constraints on the MSSM parameter space are obtained using in addition exclusions in the Higgs sector. Finally, the results are interpreted within the framework of minimal supergravity

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Springer Verlag (Germany)
Year: 1999
OAI identifier: oai:HAL:in2p3-00003573v1
Provided by: HAL-IN2P3
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