Search for excited electrons at HERA
C. AdloffFachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, GermanyV. AndreevLebedev Physical Institute, Moscow, Russia 12B. AndrieuÉcole PolytechniqueT. AnthonisInter-University Institute for High Energies ULB-VUB, Brussels; Universiteit Antwerpen (UIA), Antwerpen; BelgiumA. AstvatsatourovDESY, Zeuthen, GermanyA. BabaevInstitute for Theoretical and Experimental Physics, Moscow, Russia 18J. BährDESY, Zeuthen, GermanyP. BaranovLebedev Physical Institute, Moscow, Russia 12E. BarreletInstitut National de Physique Nucléaire et de Physique des ParticulesW. BartelS. BaumgartnerInstitut für Teilchenphysik, ETH, Zürich, Switzerland 16J. BeckerPhysik-Institut der Universität Zürich, Zürich, Switzerland 16M. BeckinghamPhysics Department, University of Manchester, Manchester, UK 9A. BeglarianYerevan Physics Institute, Yerevan, ArmeniaO. BehnkePhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 8A. BelousovLebedev Physical Institute, Moscow, Russia 12Ch. BergerI. Physikalisches Institut der RWTH, Aachen, Germany 8T. BerndtKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, GermanyJ.C. BizotUniversité Paris CitéJ. BöhmeV. BoudryLaboratoire de Physique Nucléaire et de Hautes ÉnergiesW. BraunschweigI. Physikalisches Institut der RWTH, Aachen, Germany 8V. BrissonCentre National de la Recherche ScientifiqueH.-B. BrökerIII. Physikalisches Institut der RWTH, Aachen, Germany 8Dunstan BrownD. BrunckoInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 12 13F.W. BüsserInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 8A. BunyatyanYerevan Physics Institute, Yerevan, ArmeniaA. BurrageDepartment of Physics, University of Liverpool, Liverpool, UK 9G. BuschhornMax-Planck-Institut für Physik, München, GermanyL. BystritskayaInstitute for Theoretical and Experimental Physics, Moscow, Russia 18A.J. CampbellS. CaronI. Physikalisches Institut der RWTH, Aachen, Germany 8F. Cassol-BrunnerCentre de physique des particules de MarseilleD. ClarkeRutherford Appleton Laboratory, Chilton, Didcot, UK 9C. CollardInteruniversity Institute for High EnergiesJ.G. ContrerasInstitut für Physik, Universität Dortmund, Dortmund, Germany 8Y.R. CoppensSchool of Physics and Space Research, University of Birmingham, Birmingham, UKJ. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 9M.-C. CousinouCPPM, CNRS/IN2P3, Univ. Méditerranée, Marseille, FranceB. CoxPhysics Department, University of Manchester, Manchester, UK 9G. CozzikaCEA, DSM/DAPNIA, CE-Saclay, Gif-sur-Yvette, FranceJ. CvachInstitute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic 12 15J.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 9W.D. DauInstitut für experimentelle und Angewandte Physik, Universität Kiel, Kiel, GermanyK. DaumFachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, GermanyMarcus DavidssonPhysics Department, University of Lund, Lund, Sweden 14B. DelcourtDESY, Hamburg, GermanyNicolas DelerueInstitut de Neurobiologie de la MéditerranéeR. DemirchyanYerevan Physics Institute, Yerevan, ArmeniaA. De RoeckDESY, Hamburg, GermanyE. A. De WolfInter-University Institute for High Energies ULB-VUB, Brussels; Universiteit Antwerpen (UIA), Antwerpen, Belgium 10C. DiaconuCentre de physique des particules de MarseilleJ. DingfelderPhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 8P. DixonQueen Mary and Westfield College, London, UK 9V. DodonovMax-Planck-Institut für Kernphysik, Heidelberg, GermanyJ.D. DowellSchool of Physics and Space Research, University of Birmingham, Birmingham, UKA. DroutskoiInstitute for Theoretical and Experimental Physics, Moscow, Russia 18A. DubakMax-Planck-Institut für Physik, München, GermanyC. DuprelLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceG. EckerlinV. EfremenkoInstitute for Theoretical and Experimental Physics, Moscow, Russia 18S. EgliPaul Scherrer Institut, Villigen, SwitzerlandR. EichlerPaul Scherrer Institut, Villigen, SwitzerlandF. EiseleFachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, GermanyE. EisenhandlerQueen Mary and Westfield College, London, UK 9M. EllerbrockPhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 8E. ElsenM. ErdmannPeter FaulknerSchool of Physics and Space Research, University of Birmingham, Birmingham, UK 9L. FavartInter-University Institute for High Energies ULB-VUB, Brussels; Universiteit Antwerpen (UIA), Antwerpen; BelgiumA. FedotovInstitute for Theoretical and Experimental Physics, Moscow, Russia 18R. FelstJ. FerenceiS. FerronLaboratoire de Physique Nucléaire et de Hautes ÉnergiesM. FleischerP. FleischmannY.H. FlemingSchool of Physics and Space Research, University of Birmingham, Birmingham, UK 9G. FlüggeIII. Physikalisches Institut der RWTH, Aachen, Germany 8A. FomenkoLebedev Physical Institute, Moscow, Russia 12I. ForestiUniversité Paris CitéJ. FormánekFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 12 15G. FrankeG. FrisingI. Physikalisches Institut der RWTH, Aachen, Germany 8E. GabathulerDepartment of Physics, University of Liverpool, Liverpool, UK 9K. GabathulerPaul Scherrer Institut, Villigen, SwitzerlandJ. GarveySchool of Physics and Space Research, University of Birmingham, Birmingham, UK 9J. GassnerPaul Scherrer Institut, Villigen, SwitzerlandJ. GaylerR. GerhardsC. GerlichHeidelberg UniversityS. GhazaryanInter-University Institute for High Energies ULB-VUB, Brussels; Universiteit Antwerpen (UIA), Antwerpen; BelgiumL. GoerlichInstitute for Nuclear Physics, Cracow, Poland 11N. GogitidzeLebedev Physical Institute, Moscow, Russia 12C. GrabETH ZurichVarlen GrabskiYerevan Physics Institute, Yerevan, ArmeniaH. GrässlerIII. Physikalisches Institut der RWTH, Aachen, Germany 8T. GreenshawLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, France
2002en
ABI
Аннотация
A search for excited electron ( e ∗ ) production is described in which the electroweak decays e ∗ →eγ , e ∗ →eZ and e ∗ →νW are considered. The data used correspond to an integrated luminosity of 120 pb −1 taken in e ± p collisions from 1994 to 2000 with the H1 detector at HERA at centre-of-mass energies of 300 and 318 GeV. No evidence for a signal is found. Mass dependent exclusion limits are derived for the ratio of the couplings to the compositeness scale, f / Λ . These limits extend the excluded region to higher masses than has been possible in previous direct searches for excited electrons.
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