The trigger system of the OPAL experiment at LEP

M Arignon,T Kobayashi,R Humbert,T Hilse,P Farthouat,G Schuler,R Milborrow,O Schaile,R Hammarstroem,A Penton,G Ricth,J Feyt,K Runge,M Webel,M Bramhall,M Weymann,S Jaroslawski,G W Wilson ,Hiroshi Takeda ,J Schwarz ,G Quast ,C M Roach ,K W Bell ,Haixiang Gao ,S J Hillier ,P Jovanović ,J D Gillies ,D G Charlton ,D Joos ,R D Heuer ,L J Levinson ,J W Gary ,Carolin Greiner ,A.a Carter ,P Le Dû ,A A Macbeth ,Dominik Scherer ,S J Pawley ,D R Ward ,A Wagner ,T W Pritchard ,C Weber ,A H Ball ,Takashi Kimura ,J.c Hart ,M Dittmar ,C J Virtue ,J C Hill ,J.r Carter ,R G Kellogg ,Annette F Braun ,F K Loebinger ,R W Springer ,G Mikenberg ,P M Watkins ,J A Wilson

doi:10.1016/0168-9002(92)90087-k

Abstract

This paper describes the trigger system of the OPAL detector at the e+e− collider LEP and its performance during the first year of data taking. A high level of redundancy and fine detector segmentation at the trigger level led to a high efficiency for all considered physics reactions while the trigger rates were kept low.

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