Limits On Neutral Heavy-Lepton Production From Z0 Decay

M Z Akrawy,Gideon Alexander,J Allison, P P Allport,K J Anderson,J C Armitage,G Arnison,Peter R Ashton,G Azuelos,J T M Baines, A H Ball,J Banks,G J Barker,R J Barlow,J Richard Batley, J K Becker,T Behnke, K W Bell,G Bella,Siegfried Bethke, O Biebel,U Binder,I J Bloodworth,P Bock,H Breuker,Robert M Brown,R Brun,A Buijs, H J Burckhart, P Capiluppi, R K Carnegie, A A Carter,J R Carter,C Y Chang,D G Charlton,J T M Chrin, I Cohen,W J Collins,J E Conboy, M Couch,M Coupland, M Cuffiani,S Dado,G Marco Dallavalle, P Debu,M Deninno,A Dieckmann, M Dittmar,M S Dixit, E Duchovni, I P Duerdoth, D J P Dumas, H Elmamouni,P A Elcombe,P G Estabrooks,E Etzion,F Fabbri, P Farthouat,H M Fischer,D G Fong,M T French,C Fukunaga,A Gaidot,O Ganel,J W Gary,J Gascon,N I Geddes,C N P Gee,Ch Geichgimbel,S W Gensler,F X Gentit, G Giacomelli,Gibson,W R Gibson,J D Gillies,J Goldberg,M J Goodrick, W Gorn,D Granite,Eilam Gross,P Grossewiesmann,J Grunhaus,H Hagedorn,J Hagemann,M Hansroul,C K Hargrove,J C Hart,P M Hattersley,M Hauschild,C M Hawkes,E Heflin,R J Hemingway,R D Heuer, J C Hill,S J Hillier,C Ho,J D Hobbs,P R Hobson,D Hochman,B Holl,R J Homer,S R Hou,C P Howarth,R E Hughesjones,R Humbert,P Igokemenes,H Ihssen,D C Imrie, A Jawahery,P W Jeffreys, H Jeremie, M Jimack,M Jobes,R W L Jones, P Jovanovic,D Karlen,K Kawagoe, T Kawamoto,R G Kellogg, B W Kennedy, C Kleinwort,D E Klem,G Knop, T Kobayashi, T P Kokott,L Kopke,R Kowalewski, H Kreutzmann,J Von Krogh, J Kroll,Michihiko Kuwano,P Kyberd,G D Lafferty,F Lamarche,W J Larson,M M B Lasota,J G Layter,P Le Du,P Leblanc, A M Lee, D Lellouch,P Lennert,L Lessard,L Levinson,S L Lloyd,F K Loebinger,J M Lorah,B Lorazo, M J Losty, J Ludwig,N Lupu,J Ma,A A Macbeth, M Mannelli, S Marcellini,G Maringer, A Martin, J P Martin, T Mashimo, P Mattig,U Maur,T J Mcmahon,A Mcpherson, F Meijers,D Menszner, F S Merritt,H Mes,A Michelini,R P Middleton, G Mikenberg, D J Miller,C Milstene,Masumi Minowa, W Mohr, A Montanari,T Mori, M W Moss, P G Murphy, W J Murray,B Nellen,Ha H Nguyen,M Nozaki, A P J Odowd,S W Oneale, Brendan P Oneill,F G Oakham, F Odorici,M Ogg,H Oh,M J Oreglia,S Orito,J P Pansart,G N Patrick,S J Pawley,P Pfister, J E Pilcher, J L Pinfold,D E Plane,B Poli,A Pouladdej,T W Pritchard, G Quast,J Raab,M W Redmond, D L Rees,M Regimbald,K Riles,C M Roach,S A Robins,A Rollnik,J M Roney,S Rossberg, A M Rossi,P Routenburg, K Runge, O Runolfsson,S Sanghera,R A Sansum,M Sasaki,B J Saunders,A D Schaile,O Schaile,W Schappert,P Scharffhansen,H Von Der Schmitt,Steven S Schreiber,J Schwarz,A Shapira, B C Shen, P Sherwood,A Simon,Prim B Singh, G P Siroli, A Skuja,A M Smith,Thomas J Smith,G A Snow,E J Spreadbury,R W Springer,M Sproston,K Stephens,H E Stier, R Strohmer,D Strom,Hiroshi Takeda,T Takeshita, T Tsukamoto,M Turner,G Tysarczykniemeyer,D Van Den Plas, Gordon J Van Dalen, G Vasseur,C J Virtue, A Wagner,C Wahl, C P Ward, D R Ward,J Waterhouse, P M Watkins, A T Watson, N K Watson, M Weber,S Weisz, P S Wells, N Wermes,M Weymann, G W Wilson, J A Wilson,I Wingerter,V H Winterer,N C Wood,S A Wotton,B Wunsch, T R Wyatt,R Yaari,Yi Yang,G Yekutieli,Toyonobu Yoshida, W Zeuner,G T Zorn

PHYSICS LETTERS B（1990）

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摘要

Abstract Data taken with the OPAL detector at LEP during a scan of the Z 0 resonance were searched for evidence of neutral heavy leptons that decay via mixing. Four different decay modes of the neutral heavy lepton are considered: L 0 → eW ∗ , L 0 →μ W ∗ , L 0 →τ W ∗ , and L 0 → vZ ∗ . No evidence is seen of a neutral heavy lepton signal; branching fraction limits in the range of 10 −3 –10 −4 are set for Z 0 → L 0 L 0 and for Z 0 → v L 0 ( or v L 0 ) relative to Z 0 →hadrons.

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