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AbstractAbstract
[en] This thesis is devoted to the first and second level energy trigger of the L3 experiment at LEP. This interest is justified by the difficulty to trigger on events with missing energy and/or low multiplicity of charged particles. The study of the development of electromagnetic and hadronic showers in the L3 detector allowed to derive the main features of an algorithm computing the energy balance of an interaction at the second level trigger. The study of the first level trigger, in presence of background induced by the radioactivity of uranium and in presence of correlated and uncorrelated electronic noise enabled to determine the thresholds of the first level trigger to obtain a rejection of 100 and to identify the types of backgrounds present at the second level. The first two trigger levels were tested on e+e- → τ+ τ- events
[fr]
Cette these est consacree aux deux premiers niveaux de declenchement en energie de l'experience L3 au LEP. Cet interet est justifie par la difficulte de declencher sur des canaux de physique a forte energie manquante et/ou faible multiplicite de traces chargees. L'etude du developpement des gerbes electromagnetiques et hadroniques dans l'appareillage de L3 a permis de degager les caracteristiques essentielles d'un algorithme realisant le bilan d'energie des interactions au second niveau de declenchement. L'etude du declenchement de premier niveau, en presence du bruit de fond induit par l'activite de l'uranium et de bruit electronique correle et non correle a permis de fixer les seuils de declenchements de maniere a obtenir une rejection avec un facteur 100 et d'identifier les types de bruit de fond qui atteignent le second niveau. Les deux premiers niveaux de declenchement ont ete testes sur des evenements e+e- → τ+ τ-Original Title
Simulation du declenchement de l'experience L3. Etude du declenchement sur le bilan en energie des interactions electrons-positrons
Source
1989; 151 p; These (D. es Sc.).
Record Type
Report
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Thesis/Dissertation
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