Events with large missing transverse energy at the cern collider: I.W→ τν decay and test of τ μe universality at Q2= mw2

C Albajar ,H Grassmann,H Faissner,A Kernan,C Zaccardelli,P Petta,I Ten Have,F Ghio,V Vuillemin,G Jorat,W Von Schlippe,B Mours,K Eggert,G Bauer,D Kryn,H Von Der Schmitt,P Catz,J Dorenbosch,A Placci,C Pigot,N Bains,K Bos,E Buckley,R Frey,M Debeer,C Perault,M Yvert,T Redelberger,S Geer,L Gately,S Centro,M Jimack,D Pascoli,K Wacker,A Geisser,B Van Eijk,C Rubbia,J Garvey,W Kienzle,M Pincke-Keeler,P Colas,M Markytan,G Busetto,G Sajot,M Demoulin,C Bacci,G Ciapetti,L Zanello,W Jank,J Sass,P Cennini,G Salvini,A Diciaccio,J Streets,I Zacharov,G Piano Mortari,D Dau,A Wildish,A Astbury,E Radermacher,M Della Negra,M.-N Minard,E Pietarinen,M Moricca,L Naumann,P Kyberd,S Beingessner,S Tether,M Degiorgi,D Linglin,I Sheer,E Eisenhandler,I Siotis,M Pimiä,M Corden,A Gonidec,G Bunce,D Pitman,E Tscheslog,R Leuchs,C Markou,D Schinzel,S Levegrün ,I F Fensome ,C Seez ,J Rohlf ,D Smith ,P Erhard ,A Khan ,A J Schwartz ,H Reithler ,D Summers ,J A Wilson ,A Nandi ,A Taurok ,T R Wyatt ,C Cochet ,C.-E Wulz ,F Ceradini ,D Holthuizen ,T Shah ,K Morgan ,F Szoncsó ,F Lacava ,P Sphicas ,A Savoy-Navarro ,K Sumorok ,M Krammer ,T Axon ,R Sobie ,P Nédélec ,J Kroll ,J.-P Merlo ,X Wu ,A T Meneguzzo ,R Kinnunen ,G Arnison ,E Duchovni ,G Grayer ,D Cline ,A Bettini ,V Karimäki ,D G Charlton ,D Denegri ,J A Coughlan ,S Li ,R Edgecock ,J Tuominiemi ,D Gee ,J Bellinger ,Isabelle Wingerter ,J R Batley ,Ph Ghez ,Hans Hoffmann ,A Givernaud ,S Cittolin ,L Dobrzyński ,G Cox ,J Vrána ,A Norton ,T Markiewicz ,R Keeler ,M Mohammadi ,J Colás ,N Zaganidis ,D Robinson ,N Ellis ,M Ikeda ,A Honma ,A Bézaguet ,W Rühm ,M Albrow ,C Stubenrauch ,D Clarke ,M E Levi ,B Denby ,T Virdee ,P Giacomelli ,D Samyn ,E Petrolo ,J Richman ,F Pauß ,J.p Vialle ,K Long ,S Wimpenny ,C Tao ,G Thompson ,B Aubert ,G Fontaine ,J Strauss ,Phil Flynn ,S J Haywood ,E Locci ,Y Giraud‐Héraud ,C Ghesquière ,G Maurin ,L Villaseñor ,T C Bacon ,R Frühwirth ,J P Lees ,Paolo Rossi ,W.j Haynes ,W G Scott ,R J Homer ,I R Kenyon ,W R Gibson ,J D Dowell ,J P Laugier ,T C Meyer ,O C Allkofer ,P M Watkins ,J P Porte ,J P Mendiburu ,H D Wahl ,H G Moser ,Th Müller ,P I P Kalmus ,J P Debrion ,J P Revol ,P Zotto

doi:10.1016/0370-2693(87)91561-9

Abstract

We report results based on a sample of events with large missing transverse energy corresponding to 715 nb −n of data from the UA1 experiment at the CERN proton-antiproton collider. High transverse-momentum tau-leptons from W decays are observed for the first time through their semi-hadronic decay modes and associated missing transverse energy. The measured relative rates of W→e ν, W→ μν, and W→ τν provide the first direct tests of the electron-muon-tau universality of the weak charged couplings at Q 2= m w 2. We determine g τ g e =1.01±0.09±0.05 and g μ g e =1.05±0.07±0.08 .

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