Events with large missing transverse energy at the CERN collider: III. Mass limits on supersymmetric particles

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

doi:10.1016/0370-2693(87)91509-7

Abstract

A sample of events with large missing transverse energy from 715 nb −1 of data from the UA1 experiment at the CERN proton-antiproton collider is used to search for evidence of supersymmetric particle production. Assuming that the photino is the lightest supersymmetric particle and that it is massless, we find a limit on the squark mass of m q >45 GeV/c 2 at 90% CL, independently of the gluino mass. Similarly, we find a limit on the gluino mass of m g >53 GeV/c 2 (at 90% CL) independently of the squark mass, provided that the gluino is not long-lived (i.e. provided that the squark is not too heavy, m q ⪅1 TeV/c 2 ). For equal squark and gluino masses we find a limit m q =m g >75 GeV/c 2 at 90% CL. The effect of a non-zero photino mass on these limits is studied.

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