Search For Anomalous Production Of Acoplanar Di-Lepton Events In E(+)E(-) Collisions At Root S=183 And 189 Gev

G Abbiendi,K Ackerstaff,G Alexander,J Allison,Kj Anderson,S Anderson,S Arcelli,S Asai,Sf Ashby,D Axen,G Azuelos,Ah Ball,E Barberio,Rj Barlow,Jr Batley,S Baumann,J Bechtluft,T Behnke,Kw Bell,G Bella,A Bellerive, S Bentvelsen,S Bethke,S Betts,O Biebel,A Biguzzi,Ij Bloodworth,P Bock,J Bohme,O Boeriu,D Bonacorsi,M Boutemeur,S Braibant, P Bright-Thomas,L Brigliadori,Rm Brown,Hj Burckhart,P Capiluppi,Rk Carnegie,Aa Carter,Jr Carter,Cy Chang,Dg Charlton,D Chrisman,C Ciocca,Pel Clarke,E Clay,I Cohen,Je Conboy,Oc Cooke,J Couchman,C Couyoumtzelis,Rl Coxe,M Cuffiani, S Dado,Gm Dallavalle,S Dallison,R Davis,S De Jong,A De Roeck,P Dervan,K Desch,B Dienes,Ms Dixit,M Donkers,J Dubbert,E Duchovni,G Duckeck,Ip Duerdoth,Pg Estabrooks,E Etzion,F Fabbri,A Fanfani, M Fanti,Aa Faust,L Feld,P Ferrari,F Fiedler,M Fierro,I Fleck,A Frey,A Furtjes,Di Futyan,P Gagnon,Jw Gary,G Gaycken,C Geich-Gimbel,G Giacomelli,P Giacomelli,Wr Gibson,Dm Gingrich,D Glenzinski,J Goldberg,W Gorn,C Grandi,K Graham,E Gross,J Grunhaus,M Gruwe,C Hajdu,Gg Hanson,M Hansroul, M Hapke,K Harder,A Harel,Ck Hargrove,M Harin-Dirac,M Hauschild,Cm Hawkes,R Hawkings,Rj Hemingway, G Herten,Rd Heuer,Md Hildreth,Jc Hill,Pr Hobson,A Hocker,K Hoffman,Rj Homer,Ak Honma,D Horvath,Kr Hossain,R Howard,P Huntemeyer,P Igo-Kemenes,Dc Imrie,K Ishii,Fr Jacob,A Jawahery, H Jeremie,M Jimack,Cr Jones,P Jovanovic,Tr Junk,N Kanaya,J Kanzaki,D Karlen,V Kartvelishvili,K Kawagoe,T Kawamoto,Pi Kayal,Rk Keeler,Rg Kellogg,Bw Kennedy,Dh Kim,A Klier,T Kobayashi,M Kobel,Tp Kokott,M Kolrep,S Komamiya,Rv Kowalewski,T Kress,P Krieger,J Von Krogh,T Kuhl,P Kyberd,Gd Lafferty,H Landsman,D Lanske, J Lauber,I Lawson,Jg Layter,D Lellouch, J Letts,L Levinson,R Liebisch,J Lillich,B List,C Littlewood,Aw Lloyd,Sl Lloyd,Fk Loebinger,Gd Long,Mj Losty,J Lu,J Ludwig,D Liu,A Macchiolo,A Macpherson,W Mader,M Mannelli, S Marcellini,Te Marchant,Aj Martin,Jp Martin,G Martinez,T Mashimo,P Mattig,Wj Mcdonald,J Mckenna,Ea Mckigney,Tj Mcmahon,Ra Mcpherson,F Meijers,P Mendez-Lorenzo,Fs Merritt,H Mes,I Meyer, A Michelini, S Miyara,G Mikenberg,Dj Miller,W Mohr,A Montanari, T Mori,K Nagai,I Nakamura,Ha Neal,R Nisius,Sw O'Neale,Fg Oakham,F Odorici,Ho Ogren,A Okpara,Mj Oreglia, S Orito,G Pasztor,Jr Pater,Gn Patrick,J Patt,R Perez-Ochoa,S Petzold,P Pfeifenschneider,Je Pilcher,J Pinfold,De Plane,P Poffenberger, B Poli,J Polok,M Przybycien,A Quadt,C Rembser,H Rick,S Robertson,Sa Robins,N Rodning,Jm Roney,S Rosati,K Roscoe,Am Rossi,Y Rozen,K Runge,O Runolfsson,Dr Rust,K Sachs, T Sacki,O Sahr,Wm Sang,Ekg Sarkisyan,C Sbarra,Ad Schaile,O Schaile,P Scharff-Hansen,J Schieck,S Schmitt,A Schoning,M Schroder,M Schumacher,C Schwick,Wg Scott,R Seuster,Tg Shears,Bc Shen,Ch Shepherd-Themistocleous,P Sherwood,Gp Siroli,A Skuja,Am Smith, Ga Snow,R Sobie,S Soldner-Rembold,S Spagnolo, M Sproston,A Stahl,K Stephens,K Stoll,D Strom,R Strohmer,B Surrow,Sd Talbot,P Taras,S Tarem,R Teuscher,M Thiergen,J Thomas,Ma Thomson,E Torrence,S Towers,T Trefzger,I Trigger, A Trocsanyi,E Tsur,Mf Turner-Watson,I Ueda,R Van Kooten,P Vannerem,M Verzocchi,H Voss,F Wackerle,A Wagner,D Waller,Cp Ward,Dr Ward,Pm Watkins,At Watson,Nk Watson,Ps Wells,N Wermes,D Wetterling,Js White,Gw Wilson,Ja Wilson,Tr Wyatt,S Yamashita,V Zacck,D Zer-Zion

EUROPEAN PHYSICAL JOURNAL C（2000）

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摘要

A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb(-1) at e(+)e(-) centre-of-mass energies of approximately 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV are consistent with the numbers expected from Standard Model processes, which arise predominantly from W+W- production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent. Upper limits on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs are presented in a manner intended to minimise the number of model assumptions. Assuming a 100% branching ratio for the decay (l)over tilde(R)(+/-) --> l(+/-)(chi)over tilde(1)(0), where (chi)over tilde>(0)(1) is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for m((mu)over tilde) - m((chi)over tilde)(1)(0) > 3 GeV and right-handed staus with masses below 81.0 GeV for m((tau)over tilde>) - m((chi)over tilde)(1)(0) > 8 GeV. Right-handed selectruns are excluded at 95% CL for masses below 87.1 GeV for m(e)(over tilde)(-) - m(chi)(over tilde>)(0)(1) > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming mu < -100 GeV and tan beta = 1.5. Charged Higgs bosons, H+/- are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H+/- --> tau(+/-)nu(tau).

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