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Experimental measurement of dielectric functions using ellipsometry
Slovák, Radim ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This work deals with the broad application of the spectral ellipsometry (SE) characterization method. It includes measurements of the dielectric function of thermal SiO2 and its thickness on a silicon substrate. Additionally, it presents diverse dielectric function of thin gold layer, highlighting its metallic and dielectric properties. The SE method is utilized for determining time-variable layers such as the growth rate of copper oxides. Furthermore, the dielectric function of the photoluminescent material CsPbBr3 is measured to identify quantum transitions within this perovskite material. Finally, a program in python is developed, enabling comprehensive analysis of ellipsometric data obtained via imaging microellipsometry on phase-change Sb2S3.
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Study of jet fragmentation and inclusive jet production in heavy-ion collisions with the ATLAS experiment
Slovák, Radim ; Spousta, Martin (advisor) ; Bielčíková, Jana (referee) ; Taševský, Marek (referee)
Title: Study of jet fragmentation and inclusive jet production in heavy-ion colli- sions with the ATLAS experiment Author: Mgr. Radim Slovák Institute: Institute of Particle and Nuclear Physics Supervisor: Mgr. Martin Spousta, Ph.D., Institute of Particle and Nuclear Physics, Charles University Abstract: This thesis presents two measurements - measurement of the jet frag- mentation functions and inclusive jet production in heavy-ion collisions. The frag- mentation functions are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions are measured as a function of jet trans- verse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb−1 of Pb+Pb data and 4.0 pb−1 of pp data collected in 2011 and 2013, respectively, at the same centre-of-mass energy of 2.76 TeV. Modest but signif- icant centrality-dependent modifications of fragmentation functions in Pb+Pb collisions with respect to those in pp collisions are seen. Measurements of the yield and nuclear modification factor, RAA, for inclusive jets are performed us- ing 25 pb−1 of pp data at √ s = 5.02 TeV and 0.49 nb−1 of Pb+Pb data at √ sNN = 5.02 TeV. The jets are measured over the transverse momentum range of 100-1000 GeV in six rapidity intervals covering |y| < 2.8. The magnitude of the RAA...
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Study of cosmic muons in Tile calorimeter
Slovák, Radim ; Davídek, Tomáš (advisor) ; Drásal, Zbyněk (referee)
Main goal of this thesis is to learn about detector ATLAS, mainly about his hadron calorimeter Tile Calorimeter. Next step is get knowledge about processing date with program ROOT. It is necessary to test and monitor detector for example by muons from cosmic rays before his initiation. We analysed real experimental date from single module of Tile Calorimeter here. We found out signal-to-noise ratio. Then we separed out signal and noise and we found cells which muons flew through.
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Top Quark Physics with the ATLAS Detector
Slovák, Radim ; Kvita, Jiří (advisor) ; Soustružník, Karel (referee)
In the presented diploma thesis we study the reconstruction of the top antitop system in proton-proton colisions with central mass energy 7 TeV de- livered by LHC accelerator at CERN to the ATLAS experiment. ALPGEN and MC@NLO generators are described as two main method of top antitop pairs simulations. We compare events simulated by generators to data from LHC. The background and selection criteria are summarized. Next we de- scribed various methods of the top antitop reconstruction. Finally the Z particle was also studied. 1
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Study of jet fragmentation and inclusive jet production in heavy-ion collisions with the ATLAS experiment
Slovák, Radim ; Spousta, Martin (advisor) ; Bielčíková, Jana (referee) ; Taševský, Marek (referee)
Title: Study of jet fragmentation and inclusive jet production in heavy-ion colli- sions with the ATLAS experiment Author: Mgr. Radim Slovák Institute: Institute of Particle and Nuclear Physics Supervisor: Mgr. Martin Spousta, Ph.D., Institute of Particle and Nuclear Physics, Charles University Abstract: This thesis presents two measurements - measurement of the jet frag- mentation functions and inclusive jet production in heavy-ion collisions. The frag- mentation functions are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions are measured as a function of jet trans- verse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb−1 of Pb+Pb data and 4.0 pb−1 of pp data collected in 2011 and 2013, respectively, at the same centre-of-mass energy of 2.76 TeV. Modest but signif- icant centrality-dependent modifications of fragmentation functions in Pb+Pb collisions with respect to those in pp collisions are seen. Measurements of the yield and nuclear modification factor, RAA, for inclusive jets are performed us- ing 25 pb−1 of pp data at √ s = 5.02 TeV and 0.49 nb−1 of Pb+Pb data at √ sNN = 5.02 TeV. The jets are measured over the transverse momentum range of 100-1000 GeV in six rapidity intervals covering |y| < 2.8. The magnitude of the RAA...
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Time calibration of the ATLAS Tile Calorimeter
Uhliarová, Lea ; Davídek, Tomáš (advisor) ; Slovák, Radim (referee)
The ATLAS is one of several particle experiments at the Large Hadron Col- lider at CERN. Millions of particles are colliding in it every second and it is one of two experiments which have proved the existence of the Higgs boson in 2012. The ATLAS experiment has two main goals. The search for new physics phenomena and precision measurement of the particle interactions. It consists of a complex system of detectors and read out electronics. The cal- ibration of the whole system is essential for getting correct results and mak- ing reasonable conclusions. This thesis is aimed to time calibration of Tile Calorimeter, which is one of calorimeters measuring energy of particles issued from the collision. Time monitoring and correction is performed primarily using laser pulses. In this thesis we described the used laser method which leads to the good time setting. 1
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Top Quark Physics with the ATLAS Detector
Slovák, Radim ; Kvita, Jiří (advisor) ; Soustružník, Karel (referee)
In the presented diploma thesis we study the reconstruction of the top antitop system in proton-proton colisions with central mass energy 7 TeV de- livered by LHC accelerator at CERN to the ATLAS experiment. ALPGEN and MC@NLO generators are described as two main method of top antitop pairs simulations. We compare events simulated by generators to data from LHC. The background and selection criteria are summarized. Next we de- scribed various methods of the top antitop reconstruction. Finally the Z particle was also studied. 1
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Study of cosmic muons in Tile calorimeter
Slovák, Radim ; Davídek, Tomáš (advisor) ; Drásal, Zbyněk (referee)
Main goal of this thesis is to learn about detector ATLAS, mainly about his hadron calorimeter Tile Calorimeter. Next step is get knowledge about processing date with program ROOT. It is necessary to test and monitor detector for example by muons from cosmic rays before his initiation. We analysed real experimental date from single module of Tile Calorimeter here. We found out signal-to-noise ratio. Then we separed out signal and noise and we found cells which muons flew through.
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