Search For A Scalar Top Almost Degenerate With The Lightest Neutralino E(+)E(-) Collisions At Root S Up To 202 Gev R Barate , D Decamp , P Ghez , C Goy , S Jezequel , Jp Lees , F Martin , E Merle , Mn Minard , B Pietrzyk , S Bravo , Mp Casado , M Chmeissani , Jm Crespo , E Fernandez , M Fernandez-Bosman , L Garrido , E Grauges , J Lopez , M Martinez , C Merino , R Miquel , Lm Mir , A Pacheco , D Paneque , H Ruiz , A Colaleo , D Creanza , N De Filippis , M De Palma , G Iaselli , G Maggi , M Maggi , S Nuzzo , A Ranieri , G Raso , F Ruggieri , G Selvaggi , L Silvestris , P Tempesta , A Tricomi , G Zito , X Huang , J Lin , Q Ouyang , T Wang , Y Xie , R Xu , S Xue , J Zhang , L Zhang , W Zhao , D Abbaneo , G Boix , O Buchmuller , M Cattaneo , F Cerutti , G Dissertori , H Drevermann , Rw Forty , Mi Frank , F Gianotti , Tc Greening , Jb Hansen , J Harvey , P Janot , B Jost , M Kado , V Lemaitre , P Maley , P Mato , A Minten , A Moutoussi , F Ranjard , L Rolandi , D Schlatter , M Schmitt , O Schneider , P Spagnolo , W Tejessy , F Teubert , E Tournefier , A Valassi , Jj Ward , Ae Wright , Z Ajaltouni , F Badaud , G Chazelle , O Deschamps , S Dessagne , A Falvard , P Gay , C Guicheney , P Henrard , J Jousset , B Michel , S Monteil , Jc Montret , D Pallin , Jm Pascolo , F Ferret , F Podlyski , Jd Hansen , Jr Hansen , Ph Hansen , Bs Nilsson , A Waananen , G Daskalakis , A Kyriakis , C Markou , E Simopoulou , A Vayaki , A Blondel , Jc Brient , F Machefert , A Rouge , M Swynghedauw , R Tanaka , H Videau , E Focardi , G Parrini , K Zachariadou , A Antonelli , M Antonelli , G Bencivenni , G Bologna , F Bossi , P Campana , G Capon , V Chiarella , P Laurelli , G Mannocchi , F Murtas , Gp Murtas , L Passalacqua , M Pepe-Altarelli , M Chalmers , Aw Halley , J Kennedy , Jg Lynch , P Negus , V O'Shea , B Raeven , D Smith , P Teixeira-Dias , As Thompson , R Cavanaugh , S Dhamotharan , C Geweniger , P Hanke , V Hepp , Ee Kluge , G Leibenguth , A Putzer , K Tittel , S Werner , M Wunsch , R Beuselinck , Dm Binnie , W Cameron , G Davies , Pj Dornan , M Girone , N Marinelli , J Nowell , H Przysiezniak , Jk Sedgbeer , Jc Thompson , E Thomson , R White , Vm Ghete , P Girtler , E Kneringer , D Kuhn , G Rudolph , Ck Bowdery , Pg Buck , Dp Clarke , G Ellis , Aj Finch , F Foster , G Hughes , Rwl Jones , Na Robertson , M Smizanska , I Giehl , F Holldorfer , K Jakobs , K Kleinknecht , M Krocker , As Muller , Ha Nurnberger , G Quast , B Renk , E Rohne , Hg Sander , S Schmeling , H Wachsmuth , C Zeitnitz , T Ziegler , A Bonissent , J Carr , P Coyle , C Curtil , A Ealet , D Fouchez , O Leroy , T Kachelhoffer , P Payre , D Rousseau , A Tilquin , M Aleppo , S Gilardoni , F Ragusa , H Dietl , G Ganis , A Heister , K Huttmann , G Lutjens , C Mannert , W Manner , Hg Moser , S Schael , R Settles , H Stenzel , W Wiedenmann , G Wolf , P Azzurri , J Boucrot , O Callot , M Davier , L Duflot , Jf Grivaz , P Heusse , A Jacholkowska , L Serin , Jj Veillet , I Videau , Jbd De Regie , D Zerwas , G Bagliesi , T Boccali , G Calderini , V Ciulli , L Foa , A Giammanco , A Giassi , F Ligabue , A Messineo , F Palla , G Rizzo , G Sanguinetti , A Sciaba , G Sguazzoni , R Tenchini , A Venturi , Pg Verdini , Ga Blair , J Coles , G Cowan , Mg Green , De Hutchcroft , Lt Jones , T Medcalf , Ja Strong , Jh Von Wimmersperg-Toeller , Rw Clifft , Tr Edgecock , Pr Norton , Ir Tomalin , B Bloch-Devaux , D Boumediene , P Colas , B Fabbro , G Faif , E Lancon , Mc Lemaire , E Locci , P Perez , J Rander , Jf Renardy , A Rosowsky , P Seager , A Trabelsi , B Tuchming , B Vallage , Sn Black , Jh Dann , C Loomis , Hy Kim , N Konstantinidis , Am Litke , Ma Mcneil , G Taylor , Cn Booth , S Cartwright , F Combley , Pn Hodgson , M Lehto , Lf Thompson , K Affholderbach , A Bohrer , S Brandt , C Grupen , J Hess , A Misiejuk , G Prange , U Sieler , C Borean , G Giannini , B Gobbo , H He , J Putz , J Rothberg , S Wasserbaech , Sr Armstrong , K Cranmer , P Elmer , Dps Ferguson , Y Gao , S Gonzalez , Oj Hayes , H Hu , S Jin , J Kile , Pa Mcnamara , J Nielsen , W Orejudos , Yb Pan , Y Saadi , Ij Scott , J Walsh , J Wu , Sl Wu , X Wu , G Zobernig PHYSICS LETTERS B（2000）
摘要
Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the ALEPH 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) over tilde --> c/u chi for small mass differences between the stop and the lightest neutralino. No evidence for deviations from the Standard Model expectation is found and a lower limit of 59 GeV/c(2) is set for the stop mass, independent of the stop to neutralino mass difference and of the stop lifetime. (C) 2000 Elsevier Science B.V. All rights reserved.
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