Search for excited electrons at HERA

C Adloff ,V Korbel,T Wilksen,D Wegener,K Wacker,N Keller,J Böhme,D Ozerov,J Martyniak,A Usik,L Goerlich,A Uraev,S Tchetchelnitski,A Astvatsatourov,F Sefkow,A Bunyatyan,V Nagovizin,J Scheins,G Weber,C Vallée,A Specka,A Koutov,V Lendermann,G Cozzika,A Loginov,N Malden,G Knies,A Beglarian,T Anthonis,Ch Berger,V Dodonov,B Reisert,I Tsurin,L Bystritskaya,N Loktionova,J Ferencei,M Kapichine,N Gogitidze,M Ibbotson,D Lüke,J Cvach,J Rauschenberger,R Koutouev,A Rostovtsev,K Gabathuler,R Demirchyan,D Kant,L Lytkin,S Ghazaryan,C Duprel,A Droutskoi,K Rybicki,G Buschhorn,J Žáček,G Franke,J Turnau,I Potachnikova,B Leißner,T Kluge,D Traynor,Y.H Fleming,E Wünsch,C Risler,M Fleischer,D Haidt,S Mikocki,R Roosen,E Gabathuler,I Strauch,J.E Turney,T Kuhr,R Heremans,S Michine,F Moreau,A Petrukhin,R Marshall,P Kjellberg,A Dubak,E Tzamariudaki,G Grindhammer,J Gassner,M Hilgers,S Mohrdieck,B Koblitz,G Heinzelmann,H Grässler,R Lemrani,V Lubimov,R Felst,O Nix,P Kostka,R Pöschl,S Mangano,V Efremenko,V Jemanov,H.-B Bröker,W.D Dau,P Dixon,B Stella,F Eisele,C Pascaud,V Panassik,P Höting,S Levonian,J.C Bizot,F Tomasz,S Schätzel,F Niebergall,U Straumann,S Egli,V Spaskov,S Hurling,O Behnke,J Kroseberg,J Bähr,W Bartel,S Wiesand,E Malinovski,H Henschel,C Schwanenberger,R Gerhards,S Hengstmann,S Vassiliev,M Ellerbrock,I Herynek,M Peez,V Brisson,O Karschnick,R Maraček,E Barrelet,J Garvey,B Delcourt,S Baumgartner,E Lebailly,H Spitzer,C Niebuhr,K Daum,J Formánek,J Stiewe,A Vichnevski,C Kiesling,T Greenshaw,T Laštovička,C Gerlich,A Hovhannisyan,G Frising,A Lebedev,I Foresti,R Eichler,Y Soloviev,I Sheviakov,Ç İşsever,A Valkárová,J Gayler,B Naroska,Y Vazdik,D Meer,V Schröder,L Janauschek,K Müller,A Burrage,F Cassol-Brunner,T Berndt,G Herrera,J Naumann,E Eisenhandler,W Braunschweig,Y.R Coppens,T Hadig,M Winde,M Jacquet,S Ferron,J Marks,L Hajduk,P Truöl,D Hoffmann ,F.w Büsser ,P Marage ,K Krüger ,J V Morris ,J Katzy ,H Meyer ,S J Maxfield ,P R Newman ,S Schmitt ,J Meyer ,Carrie L Johnson ,Y Sirois ,P Van Mechelen ,K H Hiller ,Frerich J Keil ,J Zálešâk ,P Schleper ,D Bruncko ,V Andreev ,M Jones ,M Nožička ,C Werner ,T Schörner ,N Werner ,H U Martyn ,F.-P Schilling ,E Lobodzinska ,A Belousov ,C Kleinwort ,E Pérez ,B Olivier ,Bogdan Povh ,C Veelken ,J P Phillips ,P Reimer ,R C W Henderson ,S Caron ,M Wessels ,P Robmann ,M Urban ,M Erdmann ,M Klein ,D South ,S Schmidt ,T Naumann ,T Sloan ,A Fedotov ,Marcus Davidsson ,C Collard ,A Vest ,J Becker ,Z Zhang ,D Schmidt ,L N Shtarkov ,Andreas Bernhard Meyer ,V Boudry ,Peter Faulkner ,D Eckstein ,A Morozov ,S.k Kotelnikov ,J B Dainton ,P Baranov ,A Campbell ,S D Kolya ,G Thompson ,H.‐C Schultz‐Coulon ,G Nowak ,V Shekelyan ,R Stamen ,L Schoeffel ,P Fleischmann ,П Мурін ,E A De Wolf ,S Lüders ,Kamil Sedlák ,J Dingfelder ,V Grabski ,G Flügge ,C Diaconu ,D Johnson ,A Schöning ,A Zhokin ,M N Mondragón ,J A Coughlan ,M Hildebrandt ,R Horisberger ,A Mehta ,E Elsen ,P Smirnov ,A Wyatt ,E.-E Woehrling ,L Favart ,C Grab ,J Kennedy ,F Zomer ,R Wallny ,D P C Sankey ,Benedict Martin Waugh ,G White ,M Jaffré ,W Erdmann ,M Wobisch ,C Wissing ,Nicolas Delerue ,J D Dowell ,J Wagner ,I R Kenyon ,L Jönsson ,B Heinemann ,Martin Karlsson ,D Milstead ,M P J Landon ,M Beckingham ,A De Roeck ,E Rizvi ,M Schneider ,Š Valkár ,G G Winter ,S V Rusakov ,P Laycock ,X Janssen ,D Clarke ,A Babaev ,J G Contreras ,B List ,D Brown ,H Jung ,G Tsipolitis ,B Łobodziński ,David C Lamb ,Bernard Andrieu ,P D Thompson ,J E Olsson ,K Meier ,D Pitzl ,B Cox ,M C Cousinou ,G Eckerlin ,W Lange ,A Vargas Trevino ,J Hladký ,A Fomenko ,G D Patel ,J Haller ,M Zur Nedden

doi:10.1016/s0370-2693(02)02764-8

Abstract

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.

Highlights

In this Letter excited electrons are searched for in three samples of data taken by the H1 experiment from 1994 to 2000 with a total integrated luminosity of 120 pb−1
Compared to previous H1 results [8] the analysis presented here benefits from an increase in luminosity by a factor of more than three and an increase of the centre-of-mass energy from 300 to 318 GeV
The first was produced with the DJANGO [9] event generator which includes QED first order radiative corrections based on HERACLES [10]

Summary

Introduction

In this Letter excited electrons are searched for in three samples of data taken by the H1 experiment from 1994 to 2000 with a total integrated luminosity of 120 pb−1. 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.

Results

Conclusion