Search for heavy neutral and charged leptons in e+e− annihilation at = 183 and 189 GeV
M. AcciarriINFN-Sezione di Milano, I-20133 Milan, ItalyP. AchardUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandO. AdrianiINFN Sezione di Firenze and University of Florence, I-50125 Florence, ItalyM. Aguilar-BenitezINFN-Sezione di Milano, I-20133 Milan, ItalyJ. AlcarazUniversity of AmsterdamG. AlemanniUniversity of Lausanne, CH-1015 Lausanne, SwitzerlandJ. AllabyEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandA. AloisioINFN-Sezione di Napoli and University of Naples, I-80125 Naples, ItalyM. G. AlviggiINFN-Sezione di Napoli and University of Naples, I-80125 Naples, ItalyG. AmbrosiUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandH. AnderhubEidgenössische Technische Hochschule, ETH Zürich, CH-8093 Zürich, SwitzerlandV.P. AndreevLouisiana State University, Baton Rouge, LA 70803, USAT. AngelescuInstitute of Atomic Physics and University of Bucharest, R-76900 Bucharest, RomaniaF. AnselmoUniversity of Bologna and INFN-Sezione di Bologna, I-40126 Bologna, ItalyA. ArefievInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaT. AzemoonUniversity of Michigan, Ann Arbor, MI 48109, USAT. AzizTata Institute of Fundamental Research, Bombay 400 005, IndiaP. BagnaiaINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyL. BaksayUniversity of Alabama, Tuscaloosa, AL 35486, USAA. BalandrasLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceR.C. BallUniversity of 'Michigan , Ann Arbor , MI 48109 , USASw. BanerjeeInstitut National de Physique Nucléaire et de Physique des ParticulesA. BarczykUniversity of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The NetherlandsR. BarillèreInstitut National de Physique Nucléaire et de Physique des ParticulesL. BaroneInstitut National de Physique Nucléaire et de Physique des ParticulesP. BartaliniINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyM. BasileUniversity of Michigan, Ann Arbor, MI 48109, USAR. BattistonNational Institute for High Energy Physics , NIKHEF , and University of Amsterdam , NL-1009 DB Amsterdam , The NetherlandsA. BayUniversity of Lausanne , CH-1015 Lausanne , SwitzerlandF. BecattiniInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaU. BeckerMassachusetts Institute of TechnologyF. BehnerInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaJ. BerdugoEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandP. BergesMassachusetts Institute of Technology , Cambridge , MA 02139 , USAB. BertucciINFN-Sezione di Bologna , 1-40126 Bologna , ItalyB.L. BetevCarnegie Mellon University, Pittsburgh, PA 15213, USAS. BhattacharyaJ Tata Institute of Fundamental Research , Bombay 400 005 , IndiaM. BiasiniUniversity of Michigan, Ann Arbor, MI 48109, USAA. BilandNuclear Physics Institute, St. Petersburg, RussiaJ.J. BlaisingInstitut National de Physique Nucléaire et de Physique des ParticulesS.C. BlythRWTH Aachen UniversityG. J. BobbinkIII. Physikalisches Instituí , RWTH , D-52056 Aachen , GermanyA. Böhm;i University and INFN, Salerno, 1-84100 Salerno, ItalyL. BoldizsárInstitut National de Physique Nucléaire et de Physique des ParticulesB. BorgiaLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceD. BourilkovIII. Physikalisches Instituí , RWTH , D-52056 Aachen , GermanyM. BourquinUniversity of Michigan, Ann Arbor, MI 48109, USAS. BracciniUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandJ.G. Branson;i University and INFN, Salerno, 1-84100 Salerno, ItalyV. BrigljevićInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaF. M. BrochuInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaA. BuffiniA. BuijsUniversity of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The NetherlandsJ.D. BurgerNational Institute for High Energy Physics, NIKHEF, and University of Amsterdam, NL-1009 DB Amsterdam, The NetherlandsW.J. BurgerINFN-Sezione di Roma and University of Rome, ' Da Sapienza ' ', 1-00185 Rome, Italy ;J. BusenitzINFN-Sezione di Bologna , 1-40126 Bologna , ItalyA. ButtonUniversity of 'Michigan , Ann Arbor , MI 48109 , USAX.D. CaiMassachusetts Institute of Technology , Cambridge , MA 02139 , USAM. CampanelliUniversity of Michigan, Ann Arbor, MI 48109, USAM. CapellMassachusetts Institute of Technology , Cambridge , MA 02139 , USAG. Cara RomeoINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyG. CarlinoINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyA.M. CartacciUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandJ. CasausEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandG. CastelliniINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyF. CavallariInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaN. CavalloInstitut National de Physique Nucléaire et de Physique des ParticulesC. CecchiInstitutul de Fizică AtomicăM. CerradaUniversity of Michigan, Ann Arbor, MI 48109, USAF. CesaroniInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaM. ChamizoUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandYue ChangDept, de Fisica de Partículas Elementales, Univ, de Santiago, E-15706 Santiago de Compostela, Spain ;lm Bulgarian Academy of Sciences, Central Lab. ofMechatronics and Instrumentation, BU-1113 Sofia, Bulgaria Center for High Energy Physics, Adv. Inst,U.K. ChaturvediWorld Laboratory , FBLJA Project , CH-1211 Geneva 23 , SwitzerlandM. ChemarinInstitute of Nuclear Physics of LyonA. ChenChina6G. ChenINFN-Sezione di Bologna , 1-40126 Bologna , ItalyG.M. ChenUniversity of AmsterdamH.F. ChenNuclear Physics Institute, St. Petersburg, RussiaH.S. ChenInstitute ofHigh Energy Physics, IHEP, 100039 Beijing,X. ChereauLaboratoire dAnnecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceG. ChiefariINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyL. CifarelliLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceF. CindoloInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaC. CivininiInstitutul de Fizică AtomicăI. ClareMassachusetts Institute of Technology , Cambridge , MA 02139 , USAR. ClareInstitut National de Physique Nucléaire et de Physique des ParticulesG. CoignetIstituto Nazionale di Fisica Nucleare, Sezione di Roma IA.P. ColijnIII. Physikalisches Instituí , RWTH , D-52056 Aachen , GermanyN. ColinoLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceS. CostantiniHumboldt-Universität zu BerlinF. CotorobaiINFN-Sezione di Napoli andB. Cozzoniy INFN-Sezione di Milano , 1-20133 Milan , ItalyB. De La CruzLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceÁ. CsillingS. CucciarelliLaboratoire d’Annecy de Physique des ParticulesT.S. DaiMassachusetts Institute of Technology , Cambridge , MA 02139 , USAJ.A. van DalenEuropean Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, SwitzerlandR. D’AlessandroLaboratoire d’Annecy de Physique des ParticulesR. de AsmundisLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, France
1999en
ABI
Abstract
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