Evidence For Z0-]E+E- At The Cern P-P Collider

P Bagnaia,M Banner,R Battiston,Ph Bloch,Franco Bonaudi,K Borer,M Borghini,J C Chollet,A Clark, C Conta,P Darriulat,L Di Lella,J Dineshansen,P A Dorsaz, L Fayard, M Fraternali, D Froidevaux,G Fumagalli,J M Gaillard,O Gildemeister,V G Goggi,H Grote,B Hahn,H Hanni,J R Hansen,P H Hansen,T Himel,V Hungerbuhler,P Jenni,O Kofoedhansen,E Lancon,M Livan,S Loucatos,B Madsen,P Mani, B Mansoulie, G Mantovani, L Mapelli,B Merkel,M Mermikides,R Mollerud, B S Nilsson,C Onions,G Parrour,F Pastore,H Plothowbesch,M Polverel,J P Repellin, A Rimoldi,A F Rothenberg,A Roussarie, G Sauvage,J Schacher, J Siegrist,H Steiner,G Stimpfl,F Stocker,J Teiger,V Vercesi,A R Weidberg,H Zaccone,J A Zakrzewski,W Zeller

PHYSICS LETTERS B（1983）

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摘要

From a search for electron pairs produced in p p collisions at s = 550 GeV we report the observation of eight events which we interpret as resulting from the process p +p→Z 0 + anything, followed by the decay Z 0 → e + + e − or Z 0 → e + + e − + γ , where Z 0 is the neutral Intermediate Vector Boson postulated by the unified electroweak theory. We use four of these events to measure the Z 0 mass M Z = 91.9 ± 1.3 ± 1.4 (systematic) GeV /c 2 .

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