Searches for scalar top and scalar bottom quarks in e+e- interactions at 161 GeV ≤ √s ≤ 183 GeV

Maurizio Acciarri,Oscar S. Adriáni,M. Aguilar-Benítez,Steven P. Ahlen,Juan Alcaraz,G. Alemanni,Jim V. Allaby,Alberto Aloisio,M. G. Alviggi,Giovanni Ambrosi,Hans B. Anderhub,V. P. Andreev,Tatiana Angelescu,F. Anselmo,A. S. Arefiev,Tofigh Azemoon,T. Aziz,Paolo Bagnaia,László A. Baksay,Sw W. Banerjee,Károly Banicz,Artur Barczyk,R. Barillère,Luciano M. Barone,Paolo Bartalini,Andrea Baschirotto,Maurizio Basile,Roberto Battiston,Aurelio Bay,Francesco Becattini,Ulrich J. Becker,F. Behner,J. Berdugo,P. Berges,Bruna Bertucci,Botio L. Betev,Satyaki R. Bhattacharya,Maurizio Biasini,Adrian Biland,Gian Mario Bilei,JJ J. Blaising,S. C. Blyth,GJ J. Bobbink,Rudolf K. Böck,Albrecht Böhm,László Boldizsár,Bruno Borgia,Dimitri Bourilkov,Maurice H. Bourquin,Stefano Braccini,James G. Branson,Vuko Brigljević,Ian C. Brock,A. Buffini,A. Buijs,Joseph D. Bürger,William J. Burger,Jerome K. Busenitz,A. Button,Xu Cai,Mario Campanelli,Michael Capell,G. Cara Romeo,Gianpaolo P. Carlino,Annamaria M. Cartacci,Jorge Casaus,Guido Castellini,Francesca Cavallari,Nicola Cavallo,Claudia Cecchi,M. Cerrada,F. Cesaroni,M. Chamizo Chamizo,Yun Chang,U. K. Chaturvedi,M. Chemarin,Augustine E. Chen,Guomeng Chen,Guoming Chen,Hui Chen,Hesheng Chen,X. Chereau,G. V. Chiefari,ChihYung Chien,Luisa Cifarelli,Federico Cindolo,Carlo Civinini,I. Clare,Robert M. Clare,Guy G. Coignet,Auke Pieter Colijn,N. Colino,Silvia Costantini,F. Cotorobai,Begoña De La Cruz,Ákos Csilling,Tiesheng Dai,Raffaello D'Alessandro,Riccardo De Asmundis,A. Degré,K. Deiters,D. Della Volpe,Peter Denes,Francesco De Notaristefani,Marcella Diemoz,D. van Dierendonck,Francesca Di Lodovico,Carla Dionisi,Michael Dittmar,Aaron Domínguez,Alessandra Doria,María Teresa Dova,Dominique Duchesneau,Pieter Duinker,Ignacio Durán,Sajan Easo,Houmani El Mamouni,Arnold Engler,FJ J. Eppling,F. C. Erné,P. Extermann,Baptiste M. Fabre,Riccardo Faccini,M. A. Falagán,Speranza Falciano,A. Favara,J. Fay,Oleg L. Fedin,Marta Felcini,T. Ferguson,Fernando Ferroni,Harm S. Fesefeldt,Emanuele Fiandrini,John H. Field,Frank Filthaut,PH H. Fisher,Ian M. Fisk,G. Forconì,L. Fredj,Kai Freüdenreich,Claudio Furetta,Y. Yu Galaktionov,Som N. Ganguli,Pablo García-Abia,Marat Gataullin,S. S. Gau,Simonetta Gentile,N. Gheordanescu,Stefano Giagu,Steven Goldfarb,J. Goldstein,Zhufang Gong,A. K. Gougas,Giorgio Gratta,M. W. Gruenewald,R. Van Gulik,VK K. Gupta,Atul Gurtu,LJ J. Gutay,Daniel Haas,B. Hartmann,Asma T. Hasan,Despoina Hatzifotiadou,Thomas Hebbeker,Alain E. Hervé,P. Hidas,J. Hirschfelder,W. C. van Hoek,Hans Hofer,Haffez R. Hoorani,Suen Hou,G. Q. Hu,I. Iashvili,Bingnian Jin,Lawrence W. Jones,Paul De Jong,I. Josa-Mutuberría,R. A. Khan,D. Kamrad,Jon S. Kapustinsky,Maninder Pal Kaur,Maria Novella Kienzle-Focacci,Dehee Kim,D. H. Kim,JinKyung Kim,Seungchul Kim,Wayne Wayne Kinnison,A. G. Kirkby,David Kirkby,Jasper Kirkby,D. D. Kiss,Wolfram K. Kittel,Alexei Klimentov,Adriaan C. König,Andreas K. Kopp,Ivan E. Korolko,Vladimir Koutsenko,Robert W. Kraemer,W. Krenz,A. V. Kunin,Pablo E. Lacentre,P. Ladrón De Guevara,Imad B. Laktineh,Gregorio Landi,C. Lapoint,Kati Lassila-Perini,Petri K. Laurikainen,A. Lavorato,Michel Lebeau,Alexei I. Lebedev,Paul L G Lebrun,Pierre Lecomte,Paul R. Lecoq,Pierre Le Coultre,Hoojeong Lee,Jean Marc Le Goff,R. Leiste,Emanuele Leonardi,Peter M. Levtchenko,Ch Li,C. H. Lin,Weiting Lin,F. L. Linde,Luca Lísta,Zhen'An Liu,Wolfgang Lohmann,Egidio Longo,Wei Lu,Yusheng Lü,K. Lübelsmeyer,Claudio Luci,David Luckey,Lamberto Luminari,Werner Lüstermann,Wengan Ma,Manas Maity,G. Majumder,Luca Malgeri,A. Malinin,C. Mañá,Dominique J J Mangeol,P. A. Marchesini,G. Marian,Alexandru A. Marín,J. P. Martin,Frank Silvio Marzano,Graziano G G Massaro,Kajari Mazumdar,Roger R. McNeil,Salvatore Mele,Leonardo Merola,M. Meschini,WJ J. Metzger,M. Von Der Mey,D. Migani,A. Mihul,A. J W van Mil,H. Milcent,Giovanni Mirabelli,Joachim Mnich,Péter Molnár,Bianca Monteleoni,Rebecca W. Moore,Tania K. Moulik,Richard P. Mount,G. S. Muanza,Franz Muheim,A. J M Muijs,Steve Nahn,M. Napolitano,Francesca Nessi-Tedaldi,Harvey B. Newman,T. Niessen,Alex Nippe,Aleandro Nisati,Hannelies Nowak,YD Oh,Giovanni C. Organtini,R. Ostonen,Carmen Palomares,D. Pandoulas,Simone Paoletti,Pierluigi S. Paolucci,Heekyeong Park,Inhee Park,G. Pascale,Giovanni Passaleva,S. Patricelli,Thomas C. Paul,M. Pauluzzi,Christoph Paus,Felicitas Paüss,D. Peach,M. Pedace,YJ Pei,Simonetta Pensotti,Denis Perret-Gallix,Brian Aagaard Petersen,S. Petrak,Aihud Pevsner,Davide Piccolo,Marco Pieri,PA A. Piroué,E. Pistolesi,Vassili V. Plyaskin,Martin Pohl,V. Pojidaev,Hans Postema,J. Pothier,Nicolas Produit,D. A. Prokofiev,J. Quartieri,Ghita Rahal-Callot,N. Raja,P. G. Giorgio Rancoita,M. Rattaggi,Gerhard Raven,Panos A. Razis,Daning Ren,Marco Rescigno,Stephen Reucroft,Tasja van Rhee,Sabine Riemann,Keith Riles,A. Robohm,Jonathan P. Rodin,Byron P. Roe,Luciano Romero,Sylvie Rosier-Lees,Simon Roth,J. Alberto Rubio,D. Ruschmeier,Hans Rykaczewski,S. Sakar,J. M. Salicio,Eusebio Sánchez,Marijn P A Sanders,Miltiadis E. Sarakinos,Christoph Schäfer,V. A. Schegelsky,S. Schmidt-Kaerst,David W. Schmitz,N. Scholz,Herwig F. Schopper,DJ J. Schotanus,J. Schwenke,G. Schwering,C. Sciacca,D. Sciarrino,Leonello Servoli,S. Shevchenko,Naiden Shivarov,V. Shoutko,J. Shukla,E. Shumilov,A. V. Shvorob,Th Siedenburg,Dongchul Son,Bryan R. Smith,Piero Spillantini,Malcolm F. Steuer,David P. Stickland,Alan L. Stone,Howard Stone,Basil J. Stoyanov,Arno Straessner,K. Sudhakar,G. G. Sultanov,La-Zhen Sun,G. F. Susinno,Henry Suter,John D. Swain,Xiaowei Tang,Ludwig Tauscher,Lucas L. Taylor,Charles J W P Timmermans.,Samuel C C Ting,Steve Ting,Suresh C. Tonwar,József J. Tóth,Christopher G. Tully,Karen Tung,Yoshi Uchida,Jürgen Ulbricht,Enzo Valente,Gy Vesztergombi,I. Vetlitsky,Gert M. Viertel,Stefano Villa,M. Vivargent,Sotirios Vlachos,Helmut R. Vogel,Hans G. Vogt,Igor A. Vorobiev,An A. Vorobyov,A. Vorvolakos,M. Wadhwa,Wolfgang Wallraff,Jianchun Wang,Xiaolian Wang,Zhaomin Wang,Ainas Weber,Shouxiang Wu,St Wynhoff,Jian Xu,Zizong Xu,Bin Yang,Changgen Yang,H. J. Yang,Min Yang,Jian Ye,S. C. Yeh,J. M. You,An N. Zalite,Yu U. Zalite,P. Zemp,Yu Zeng,Ziping Zhang,Bin Zhou,Guoyi Zhu,Renyuan Zhu,Antonino Zichichi,F. Ziegler,Gy Zilizi

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics（1999）

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摘要

Searches for scalar top and scalar bottom quarks have been performed at center-of-mass energies between 161 GeV and 183 GeV using the L3 detector at LEP. No signal is observed. Model-independent limits on production cross sections are determined for the two decay channels t̃1 → cχ̃0 1 and b̃1 → b χ̃0 1. Within the framework of the Minimal Supersymmetric extension of the Standard Model mass limits are derived. For mass differences between t̃1 and χ̃0 1 greater than 10 GeV a 95% C.L. limit of 81.5 GeV is set on the mass of the Supersymmetric partner of the left-handed top. A supersymmetric partner of the left-handed bottom with a mass below 80 GeV is excluded at 95% C.L. if the mass difference between b̃1 and χ̃1 is greater than 20 GeV. © 1999 Published by Elsevier Science B.V. All rights reserved.

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