Search for heavy isosinglet neutrinos in e+e− annihilation at GeV
M. AcciarriINFN-Sezione di Milano, I-20133 Milan, ItalyP. AchardUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandО. АдрианиINFN Sezione di Firenze and University of Florence, I-50125 Florence, ItalyM. Aguilar-BenitezCentro de Investigaciones Energeticas , Medioambientales y Tecnologíc^s , CIEE^^T , E^-2^8040U^^rúd , Sp^a^J. Alcaraz MaestreCentro de Investigaciones Energeticas , Medioambientales y Tecnologíc^s , CIEE^^T , E^-2^8040U^^rúd , Sp^a^G. 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. AngelescuInstitutul de Fizică AtomicăF. AnselmoUniversity of BolognaA. 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 de Physique des ParticulesR.C. BallUniversity of 'Michigan , Ann Arbor , MI 48109 , USASw. BanerjeeLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceA. BarczykNational Institute for High Energy Physics , NIKHEF , and University of 'Amsterdam . NL-1009 DB Amsterdam , The NetherlandsR. BarillèreLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceL. BaroneINFN-Sezione di Bologna , I-40126 Bologna , ItalyP. BartaliniINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyM. BasilehR. BattistonIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaA. BayUniversity of Lausanne , CH-1015 Lausanne , SwitzerlandF. BecattiniINFN-Sezione di Bologna , I-40126 Bologna , ItalyU. BeckerMassachusetts Institute of Technology , Cambridge , MA 02139 , USAF. BehnerhJ. BerdugoCentro de Investigaciones Energeticas , Medioambientales y Tecnologíc^s , CIEE^^T , E^-2^8040U^^rúd , Sp^a^P. BergesMassachusetts Institute of Technology , Cambridge , MA 02139 , USAB. BertucciInstitut National de Physique Nucléaire et de Physique des ParticulesB.L. BetevS. BhattacharyahM. BiasiniUniversity of Michigan, Ann Arbor, MI 48109, USAA. BilandHumboldt University , D-10099 Berlin , Germany iJ.J. BlaisingLaboratoire d' Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX', FranceS.C. BlythINFN-Sezione di Bologna , I-40126 Bologna , ItalyG. J. BobbinkIII. Physikalisches Institut , RWTH , D-52056Aachen , GermanyA. BöhmI. Physikalisches Institut , RWTH , D-52056Aachen , Germany, andL. BoldizsárLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceB. BorgiaINFN-Sezione di Bologna , I-40126 Bologna , ItalyD. BourilkovLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceM. BourquinUniversity of Michigan, Ann Arbor, MI 48109, USAS. BracciniInstitut National de Physique Nucléaire et de Physique des ParticulesJ.G. BransonV. BrigljevićINFN-Sezione di Bologna , I-40126 Bologna , ItalyF. BrochuInstitute for Theoretical and Experimental PhysicsA. BuffiniUniversity of Bologna andA. BuijsJ.D. BurgerINFN-Sezione di Perugia and Universita Degli Studi di Perugia, I-06100 Perugia, ItalyW.J. BurgerINFN-Sezione di Perugia and Universita Degli Studi di Perugia, I-06100 Perugia, ItalyJ. BusenitzINFN-Sezione di Bologna , I-40126 Bologna , ItalyA. ButtonUniversity of 'Michigan , Ann Arbor , MI 48109 , USAX.D. CaiMassachusetts Institute of Technology , Cambridge , MA 02139 , USAM. CampanelliUniversity of Bologna andM. 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. CasausCentro de Investigaciones Energeticas , Medioambientales y Tecnologíc^s , CIEE^^T , E^-2^8040U^^rúd , Sp^a^G. 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. CecchiUniversity of Geneva , CH-1211 Geneva 4 , SwitzerlandM. CerradaCentro de Investigaciones Energeticas , Medioambientales y Tecnologíc^s , CIEE^^T , E^-2^8040U^^rúd , Sp^a^F. CesaroniInstitute of Theoretical and Experimental Physics, ITEP, Moscow, RussiaM. ChamizoUniversity of Michigan, Ann Arbor, MI 48109, USAYu-Hsiang ChangU.K. ChaturvediWorld Laboratory , FBLJA Project , CH-1211 Geneva 23 , SwitzerlandM. ChemarinInstitut de PhysiqueA. Chent SEFT , Research Institute for High Energy Physics , P.O. Box 9 , SF-00014 Helsinki , FinlandG. ChenINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyG.M. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaH.F. ChenInstitute of High Energy PhysicsH.S. ChenInstitute of High Energy Physics , IHEP , 100039 Beijing , ChinaX. ChéreauLaboratoire d' Annecy-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. CifarelliInstitut National de Physique Nucléaire et de Physique des ParticulesF. CindoloINFN Sezione di Firenze and University of 'Florence , I-50125 Florence , ItalyC. CivininiafI. ClareINFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, ItalyR. ClareInstitut National de Physique Nucléaire et de Physique des ParticulesG. CoignetLaboratoire d' Annecy-le-Vieux de Physique des Particules , LAPP , IN2P3-CNRS , BP 110 , F-74941 Annecy-le-Vieux CEDEX' , FranceA. P. ColijnIII. Physikalisches Institut , RWTH , D-52056Aachen , GermanyN. ColinoLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceS. CostantiniLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceF. CotorobaiInstitute of Atomic Physics and University of Bucharest , R-76900 Bucharest , RomaniaB. CozzoniLaboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceB. De La CruzInstitut National de Physique Nucléaire et de Physique des ParticulesÁ. CsillingS. CucciarelliInstitut National de Physique Nucléaire et 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-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, FranceR. de AsmundisIstituto Nazionale di Fisica Nucleare, Sezione di Napoli
1999en
ABI
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