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19 April 2024

» arxiv » hep-ex/0202045

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The multilevel trigger system of the DIRAC experiment
L.Afanasyev ; M.Gallas ; D.Goldin ; A.Gorin ; V.Karpukhin ; P.Kokkas ; A.Kulikov ; K.Kuroda ; I.Manuilov ; K.Okada ; C.Schuetz ; A.Sidorov ; M.Steinacher ; F.Takeutchi ; L.Tauscher ; S.Vlachos ; V.Yazkov ;
Date:	28 Feb 2002
Journal:	Nucl.Instrum.Meth. A491 (2002) 376-389
Subject:	hep-ex
Abstract:	The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a low relative momentum typical of the physical process under study. One of these processors employs the drift chamber data, another one is based on a neural network algorithm and the others use various hit-map detector correlations. Two versions of the trigger system used at different stages of the experiment are described. The complete system reduces the event rate by a factor of 1000, with efficiency $geq$95% of detecting the events in the relative momentum range of interest.
Source:	arXiv, hep-ex/0202045
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