Search for a scalar top almost degenerate with the lightest neutralino e(+)e(-) collisions at root s up to 202 GeV

Authors
Barate, R Decamp, D Ghez, P Goy, C Jezequel, S Lees, JP Martin, F Merle, E Minard, MN Pietrzyk, B Bravo, S Casado, MP Chmeissani, M Crespo, JM Fernandez, E Fernandez-Bosman, M Garrido, L Grauges, E Lopez, J Martinez, M Merino, C Miquel, R Mir, LM 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, J Ouyang, Q Wang, T Xie, Y Xu, R Xue, S Zhang, J Zhang, L Zhao, W Abbaneo, D Boix, G Buchmuller, O Cattaneo, M Cerutti, F Dissertori, G Drevermann, H Forty, RW Frank, MI Gianotti, F Greening, TC Hansen, JB Harvey, J Janot, P Jost, B Kado, M Lemaitre, V Maley, P Mato, P Minten, A Moutoussi, A Ranjard, F Rolandi, L Schlatter, D Schmitt, M Schneider, O Spagnolo, P Tejessy, W Teubert, F Tournefier, E Valassi, A Ward, JJ Wright, AE Ajaltouni, Z Badaud, F Chazelle, G Deschamps, O Dessagne, S Falvard, A Gay, P Guicheney, C Henrard, P Jousset, J Michel, B Monteil, S Montret, JC Pallin, D Pascolo, JM Ferret, F Podlyski, F Hansen, JD Hansen, JR Hansen, PH Nilsson, BS Waananen, A Daskalakis, G Kyriakis, A Markou, C Simopoulou, E Vayaki, A Blondel, A Brient, JC Machefert, F Rouge, A Swynghedauw, M Tanaka, R Videau, H Focardi, E Parrini, G Zachariadou, K Antonelli, A Antonelli, M Bencivenni, G Bologna, G Bossi, F Campana, P Capon, G Chiarella, V Laurelli, P Mannocchi, G Murtas, F Murtas, GP Passalacqua, L Pepe-Altarelli, M Chalmers, M Halley, AW Kennedy, J Lynch, JG Negus, P O'Shea, V Raeven, B Smith, D Teixeira-Dias, P Thompson, AS Cavanaugh, R Dhamotharan, S Geweniger, C Hanke, P Hepp, V Kluge, EE Leibenguth, G Putzer, A Tittel, K Werner, S Wunsch, M Beuselinck, R Binnie, DM Cameron, W Davies, G Dornan, PJ Girone, M Marinelli, N Nowell, J Przysiezniak, H Sedgbeer, JK Thompson, JC Thomson, E White, R Ghete, VM Girtler, P Kneringer, E Kuhn, D Rudolph, G Bowdery, CK Buck, PG Clarke, DP Ellis, G Finch, AJ Foster, F Hughes, G Jones, RWL Robertson, NA Smizanska, M Giehl, I Holldorfer, F Jakobs, K Kleinknecht, K Krocker, M Muller, AS Nurnberger, HA Quast, G Renk, B Rohne, E Sander, HG Schmeling, S Wachsmuth, H Zeitnitz, C Ziegler, T Bonissent, A Carr, J Coyle, P Curtil, C Ealet, A Fouchez, D Leroy, O Kachelhoffer, T Payre, P Rousseau, D Tilquin, A Aleppo, M Gilardoni, S Ragusa, F Dietl, H Ganis, G Heister, A Huttmann, K Lutjens, G Mannert, C Manner, W Moser, HG Schael, S Settles, R Stenzel, H Wiedenmann, W Wolf, G Azzurri, P Boucrot, J Callot, O Davier, M Duflot, L Grivaz, JF Heusse, P Jacholkowska, A Serin, L Veillet, JJ Videau, I de Regie, JBD Zerwas, D Bagliesi, G Boccali, T Calderini, G Ciulli, V Foa, L Giammanco, A Giassi, A Ligabue, F Messineo, A Palla, F Rizzo, G Sanguinetti, G Sciaba, A Sguazzoni, G Tenchini, R Venturi, A Verdini, PG Blair, GA Coles, J Cowan, G Green, MG Hutchcroft, DE Jones, LT Medcalf, T Strong, JA von Wimmersperg-Toeller, JH Clifft, RW Edgecock, TR Norton, PR Tomalin, IR Bloch-Devaux, B Boumediene, D Colas, P Fabbro, B Faif, G Lancon, E Lemaire, MC Locci, E Perez, P Rander, J Renardy, JF Rosowsky, A Seager, P Trabelsi, A Tuchming, B Vallage, B Black, SN Dann, JH Loomis, C Kim, HY Konstantinidis, N Litke, AM McNeil, MA Taylor, G Booth, CN Cartwright, S Combley, F Hodgson, PN Lehto, M Thompson, LF Affholderbach, K Bohrer, A Brandt, S Grupen, C Hess, J Misiejuk, A Prange, G Sieler, U Borean, C Giannini, G Gobbo, B He, H Putz, J Rothberg, J Wasserbaech, S Armstrong, SR Cranmer, K Elmer, P Ferguson, DPS Gao, Y Gonzalez, S Hayes, OJ Hu, H Jin, S Kile, J McNamara, PA Nielsen, J Orejudos, W Pan, YB Saadi, Y Scott, IJ Walsh, J Wu, J Wu, SL Wu, X Zobernig, G
Citation
R. Barate et al., Search for a scalar top almost degenerate with the lightest neutralino e(+)e(-) collisions at root s up to 202 GeV, PHYS LETT B, 488(3-4), 2000, pp. 234-246
Citations number
21
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → ACNP
Volume
488
Issue
3-4
Year of publication
2000
Pages
234 - 246
Database
ISI
SICI code
0370-2693(20000907)488:3-4<234:SFASTA>2.0.ZU;2-Z
Abstract
Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the AL EPH detector at LEP corresponding to an integrated luminosity of 411 pb(-1) , are analysed in a search for the scalar top in the decay channels (t) ove r tilde --> c/u chi for small mass differences between the stop and the lig htest neutralino. No evidence for deviations from the Standard Model expect ation is found and a lower limit of 59 GeV/c(2) is set for the stop mass, i ndependent of the stop to neutralino mass difference and of the stop lifeti me. (C) 2000 Elsevier Science B.V. All rights reserved.