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National Repository of Grey Literature 3 records found  Search took 0.02 seconds. 

(100)
Trigger v experimentu ATLAS
 Vidláková, Zuzana ; Zálešák, Jaroslav (referee) ; Vrba, Václav (advisor)
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(99)
Jets in pp and PbPb collisions at LHC
 Rybář, Martin ; Dolejší, Jiří (advisor) ; Davídek, Tomáš (referee)
The ATLAS detector is designed primarily for proton-proton collisions, and potentially interesting events are selected by a three-level trigger system. We have studied the performance of the ATLAS trigger system for Pb+Pb collisions. A brief introduction to the heavy ion physics with focus on jets and some results from RHIC experiments are presented in first three chapters. Then we describe the ATLAS detector, its trigger system and three strategies for L1 trigger. We focus on the first level calorimeter trigger and propose modest changes to the default trigger strategy to address specific characteristics of heavy ion collisions at the LHC. Results from performance studies of proposed strategies are presented. We describe current status of L2 jet trigger algorithm designed for p+p collisions. Then we present developed algorithm with background subtraction adapted to heavy ion collisions and its performance.
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(99)
Development of optimal algorithms for the selection of rare semimuonic B decays in ATLAS
 Scheirich, Daniel ; Doležal, Zdeněk (advisor) ; Mašík, Jiří (referee)
In this thesis we propose the trigger algorithm for the semimuonic rare B decay selection in ATLAS experiment and we study its performance using the Monte Carlo sample of b 0u+u. The cut optimisation have been performed in order to obtain the optimal cut values and the signal rate for the process was estimated. The feasibility and performance of the tag-and-probe method for the calibration of di-muon triggers is investigated, too. Eects of the systematic uncertainties of the method on the measurements of J/ polarisation and the forward-backward asymmetry of b 0u+u were studied.
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