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Detailed Investigation of Electron Antineutrino Oscillations in the Daya Bay Experiment
Roskovec, Bedřich ; Leitner, Rupert (advisor) ; Šimkovic, Fedor (referee) ; Zálešák, Jaroslav (referee)
Observed disappearance of reactor antineutrinos in the short baseline in Daya Bay can be explained by the phenomenon of neutrino flavour oscillations. The analysis in standard three- neutrino framework provides the best measurement of mixing angle of θ13 and the value of effective mass squared difference ∆m2 ee with comparable precision with other experiments. The unprecedented precision of Daya Bay motivates us to extend our search beyond standard three-neutrino oscillation scheme. It this thesis, we have explored two scenarios of possible physics Beyond Standard Model (BSM). We have tested the fundamental symmetry of the nature by searching for the Lorentz Invariance violation effect within the framework of the Standard-Model Extension (SME). Such an effect could be observed as a deviation from three- neutrino oscillation prediction in the oscillated antineutrino spectrum. Since we have not observed any significant deviation, we have been able to set the limits on the SME parameters. Some of the limits were measured for the first time while some turned out not to be competitive with the measurement of other experiments. We have also performed search for Non-standard Interactions (NSIs) in the Daya Bay. Being forbidden in the Standard Model, these interactions are predicted by BSM theories for which...
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Studium kanálu J/Psi + foton v proton-protonových srážkách pomocí detektoru ATLAS na LHC
Vidláková, Zuzana ; Vrba, Václav (advisor) ; Zálešák, Jaroslav (referee)
Title: Analysis of J/Psi + photon production in proton-proton collisions on ATLAS at LHC Author: Bc. Zuzana Vidláková Department: Institute of particle and nuclear physics Supervisor: prom. fyz. Václav Vrba, CSc. (Academy of Sciences of the Czech Republic) Abstract: The subject of this thesis is physics connected to quarkonia and their studies at the ATLAS detector situated at LHC in CERN, Geneva. In this thesis, following topics are cov- ered: ATLAS detector, history of physics connected to quarkonia, production mechanisms of quarkonia, software used at CERN for data analysis and cross-section measurement of J/Psi + photon continuum. The analysis was done on behalf of the B-physics working group at ATLAS. Keywords: CERN, LHC, ATLAS, B-fyzika, quarkonia
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Data analysis of the calorimeter CALICE
Bulánek, Boris ; Žáček, Josef (advisor) ; Zálešák, Jaroslav (referee)
In the present work we study the muon calibration of a hadrnic calorimeter. The calibration issue is divided into three parts. Description of the calibration principle and a comparison of the results with the previous results is described in the rst part. The method of the temperature and voltage corrections is presented in the second part. Also a comparison between the new and previous results is included. The last part is devoted to the study of myom track nding. The modied algorithm for searching muons was developed and compared with the default traknding algorithm.
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