Search for unstable heavy and excited leptons in e+e− collisions at ∝s = 170-172 GeV

K Ackerstaff,B C Shen,L Brigliadori,P Taras,W J Mcdonald,E A Mckigney,M Bobinski,K Stoll,D G Fong,M F Turner-Watson,M Hapke,S R Lautenschlager,A Joly,R K Carnegie,M Morii,P M Watkins,A Rooke,P Pfeifenschneider,M Fierro,I Cohen,G N Patrick,T R Junk,A Skillman,G P Siroli,B Poli,C Y Chang,A K Honma,O Schaile,D Lanske,F G Oakham,K R Hossain,S M Gascon-Shotkin,K Runge,M J Losty,J Von Krogh,S Söldner-Rembold,A Fürtjes,J Grunhaus,S D Bird,P I Kayal,E Do Couto E Silva,T Behnke,U Jost,N Altekamp,F S Merritt,J E Bloomer,U Müller,A A Faust,A Posthaus,B W Kennedy,F Scharf,D Karlen,V Kartvelishvili,M Kolrep,R M Brown,W Mohr,J G Layter,P Poffenberger,M Thiergen,A S Turcot,R J Hemingway,G Duckeck,S Braibant,R G Kellogg,M Jimack,J Ludwig,V Zacek,A M Rossi,C M Hawkes,A D Schaile,S Petzold,S D Talbot,P G Estabrooks,M J Oreglia,P Vikas,M Jones,I Nakamura,C Markus,C R Jones,C Dallapiccola,R Mir,C P Ward,A Macpherson,T Saeki,C K Hargrove,P Mättig,D Rigby,R J Homer,N J Oldershaw,J R Carter,E H Vokurka,M Hansroul,P Gagnon,M J Goodrick,H O Ogren,L A Del Pozo,J C Hill,D C Imrie,S A Robins,B Stockhausen,J M Roney,W R Gibson,S Orito,O C Cooke,R W Springer,J E Conboy,N K Watson,D Lazic,J W Gary,P W Jeffreys,R Bürgin,C Hartmann,K Sachs,F K Loebinger,N I Geddes,M Sproston,A T Watson,F Odorici,K W Bell,J Bechtluft,D M Gingrich,A Sittler,T Kress,J Pálinkás,W G Scott,B Wilkens,J E Pilcher,T Geralis,W Gorn,C Beeston,P Utzat,R Van Kooten,M Foucher,J Lauber,J Goldberg,M Hauschild,R Bartoldus,P Kyberd,D R Rust,D E Plane,A Klier,A Michelini,M Boutemeur,H Mes,W P Lai,D E Hutchcroft,P Bock,T Kawamoto,A A Carter,I J Bloodworth,A J Martin,P Hüntemeyer,G Giacomelli,H Voss,E Lefebvre,R D Heuer,G M Dallavalle,D L Rees,R Perez-Ochoa,J Steuerer,D Chrisman,T P Kokott,M S Dixit,P S Wells,A Biguzzi,B Nellen,D Zer-Zion,I P Duerdoth,J Patt,J Gascon,K Stephens,A Jawahery,R J Barlow,E Tsur,P Routenburg,V Gibson,G Yekutieli,A M Smith,D Axen,D R Ward ,S J De Jong ,J A Mckenna ,J A Wilson ,S L Lloyd ,S Mihara ,P Schleper ,J Kirk ,J Meyer ,T Shears ,G D Long ,L J Levinson ,R Folman ,G Lafferty ,G A Snow ,M Schumacher ,A Macchiolo ,J Schieck ,Thomas J Mcmahon ,H M Fischer ,J P Martín ,C Grandi ,J R Batley ,P Krieger ,A N Bell ,P Giacomelli ,G Alexander ,D Horváth ,K Ishii ,N Wermes ,S Menke ,S J Hillier ,M Schröder ,D S Koetke ,G Wolf ,S Marcellini ,R Tafirout ,D Eatough ,Z L Trocsanyi ,C Hajdú ,S Bethke ,P E.l Clarke ,R Sobie ,H Neal ,J L Pinfold ,S Baumann ,D I Futyan ,S Robertson ,S W O’neale ,G Azuelos ,D Lellouch ,G Herten ,R Davis ,M Doucet ,C Sbarra ,Ch Geich-Gimbel ,H Evans ,I M Trigger ,S Arcelli ,D Glenzinskí ,S Asai ,T Mori ,S Kluth ,D Strom ,S Tarem ,E Barberio ,G Jones ,J S White ,J Allison ,M Hildreth ,E Duchovni ,Shinji Yamashita ,J Letts ,M Herndon ,E Ros ,S Schmitt ,Shun‐Ichi Tanaka ,T R Wyatt ,Ö Runólfsson ,Robert Howard ,M Cuffiani ,F Meijers ,M Mannelli ,Martin Ingram ,G Bella ,R A Mcpherson ,B Dienes ,N Rodning ,O Biebel ,P Jovanović ,A Oh ,S Dado ,Tatsuo Kobayashi ,S Komamiya ,A Skuja ,K Nagai ,R Ryłko ,M Gruwé ,B Schmitt ,S Bentvelsen ,P Igo‐Kemenes ,G W Wilson ,H Jérémie ,S Towers ,R Keeler ,A I Mincer ,A Wagner ,P R Hobson ,D G Charlton ,G Martı́nez ,A H Ball ,D J Miller ,A Montanari ,P A Hart ,H.‐C Schultz‐Coulon ,F Fabbri ,M Thomson ,P Schenk ,G Mikenberg ,R J Teuscher ,Uwe Rüppel ,J E.g Edwards ,G Hanson ,P Sherwood ,C D Burgard ,D Bonacorsi ,H Burckhart ,K Kawagoe ,T Mäshimo ,S Anderson ,Meirin Oan Evans ,I Fleck ,G Pásżtor ,A M Lee ,V Blobel ,K Desch ,B Bouwens ,M Kobel ,Y Rozen ,M Fanti ,P Szymański ,C Schwick ,C H Shepherd-Themistocleous ,E K.g Sarkisyan ,R Lahmann ,E Gross ,R Nisius ,J R Pater ,F Fiedler ,M Verzocchi ,P Capiluppi ,M J Pearce ,R J Hawkings ,A Schüning ,F Wückerle ,E Von Türne ,Roberto Giacomelli ,P Scharff-Hansen ,K J Anderson

doi:10.1007/bf01245797

Search for unstable heavy and excited leptons in e+e− collisions at ∝s = 170-172 GeV

K Ackerstaff, B C Shen + Show 336 more

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https://doi.org/10.1007/bf01245797

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Journal: The European Physical Journal C	Publication Date: Mar 1, 1998
Citations: 10

Affiliation: European Organization for Nuclear Research, University of California, Riverside, University of Bologna, Université de Montréal, University of Alberta, University College London, University of Freiburg, University of Maryland, College Park, Queen Mary University of London, Duke University, Carleton University, Kobe University, University of Birmingham, RWTH Aachen University, Tel Aviv University, Rutherford Appleton Laboratory, University of Victoria, Ludwig-Maximilians-Universität München, Heidelberg University, University of Manchester, Indiana University, University of Cambridge, University of Chicago, University of Bonn, Universität Hamburg, Weizmann Institute of Science, Brunel University London, Technion – Israel Institute of Technology, Hungarian Academy of Sciences, University of Oregon, University of British Columbia, New York University

#Heavy Leptons #Charged Leptons + Show 8 more

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Abstract

We have searched for unstable neutral and charged heavy leptons, N and L±, and for excited states of neutral and charged leptons, ν* e*, μ* and τ*, in e+e− collisions at centre-of-mass energies of 170 and 172 GeV using the OPAL detector at LEP. No evidence for their existence was found. From the analysis of charged-current decays of pair-produced unstable heavy leptons, and of charged-current and photonic decays of pair-produced excited leptons, lower limits on their masses are derived. From the analysis of charged-current and photonic decays of singly-produced excited leptons, upper limits on the ratio of the coupling to the compositeness scale, ϕ/λ, are determined for masses up to the kinematic limit.

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