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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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Cross-section measurements of the Higgs boson decaying into a pair of tau leptons with the ATLAS detector
Mlynáriková, Michaela ; Davídek, Tomáš (advisor) ; Hubáček, Zdeněk (referee) ; Šumbera, Michal (referee)
The ATLAS experiment is one of the two general-purpose detectors at the Large Hadron Collider (LHC) at the European Organisation for Nuclear Research (CERN) in Switzerland. ATLAS is designed for precision mea- surements of particle properties, the search of the Higgs boson and new physics beyond the Standard Model. The experiment got worldwide atten- tion in 2012, when after the collaborative efforts with the CMS experiment the Higgs boson discovery was announced. After the discovery, the preci- sion measurements of its properties became one of the main objectives of the LHC physics programme, since a potential observation of deviations from the Standard Model predictions might lead to the discovery of new physics. In this thesis, the measurements of the Higgs boson production cross-sections in the H → ττ decay channel are presented. Based on the proton-proton collision data collected at the centre-of-mass energy of 13 TeV in years 2015 and 2016, the signal over the expected background from the other Standard Model processes is established with the observed significance of 4.4σ. Com- bined with the data collected at 7 and 8 TeV, the observed signal significance amounts to 6.4σ, which constitutes a single experiment observation of the H → ττ decays by ATLAS. All presented results are found to be consistent with...
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Tile Calorimeter testbeam data analysis
Uhliarová, Lea ; Davídek, Tomáš (advisor) ; Dolejší, Jiří (referee)
Tile Calorimeter modules are regularly tested in the CERN SPS North Area, as they are an integral part of the ATLAS experiment at the Large Hadron Collider at CERN. In this thesis, test beam data from November 2018 were used for two separate analyses. Muon SPS H8 beam allowed for the review of radial electromagnetic cali- bration in the extended barrel module EBC65. Data from November 2018 test beam confirmed the correctness of previously established and used constants for rectifying uneven response in A, BC and D cell rows. In the second analysis, hadron beam from the SPS accelerator impinging on the Tile Calorimeter modules in the projective geometry was utilized. It served to determine the distribution of the mean energy in the calorimeter for hadronic showers in Tile Calorimeter at η varying from −0.05 up to −0.65. 1
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Cross-section measurements of the Higgs boson decaying into a pair of tau leptons with the ATLAS detector
Mlynáriková, Michaela ; Davídek, Tomáš (advisor) ; Hubáček, Zdeněk (referee) ; Šumbera, Michal (referee)
The ATLAS experiment is one of the two general-purpose detectors at the Large Hadron Collider (LHC) at the European Organisation for Nuclear Research (CERN) in Switzerland. ATLAS is designed for precision mea- surements of particle properties, the search of the Higgs boson and new physics beyond the Standard Model. The experiment got worldwide atten- tion in 2012, when after the collaborative efforts with the CMS experiment the Higgs boson discovery was announced. After the discovery, the preci- sion measurements of its properties became one of the main objectives of the LHC physics programme, since a potential observation of deviations from the Standard Model predictions might lead to the discovery of new physics. In this thesis, the measurements of the Higgs boson production cross-sections in the H → ττ decay channel are presented. Based on the proton-proton collision data collected at the centre-of-mass energy of 13 TeV in years 2015 and 2016, the signal over the expected background from the other Standard Model processes is established with the observed significance of 4.4σ. Com- bined with the data collected at 7 and 8 TeV, the observed signal significance amounts to 6.4σ, which constitutes a single experiment observation of the H → ττ decays by ATLAS. All presented results are found to be consistent with...
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Monte Carlo Simulations of the Tile Calorimeter and Measurement of the Z→ττ Cross Section with the ATLAS Detector
Nováková, Jana ; Davídek, Tomáš (advisor) ; Trávníček, Petr (referee) ; Taševský, Marek (referee)
Title: Monte Carlo Simulations of the Tile Calorimeter and Measurement of the Z → ττ Cross Section with the ATLAS Detector Author: Mgr. Jana Nováková Department: Institute of Particle and Nuclear Physics (IPNP) Supervisor: RNDr. Tomáš Davídek, PhD., IPNP Supervisor's e-mail address: davidek@ipnp.troja.mff.cuni.cz Abstract: The Monte Carlo simulations of the Tile calorimeter in the ATLAS experiment at the LHC, especially the electronic noise and multiple interactions (co-called pile-up), are discussed in the thesis. A good agreement in the cell energy distribution between data and Monte Carlo simulations is found. The cross section measurement of Z → ττ events with the ττ invariant mass between 66 and 116 GeV with the ATLAS experiment is described in the next part of the thesis. Data samples collected during 2011 corresponding to the integrated luminosity of 1.34 - 1.55 fb−1 are used for the analysis. The measurements are performed in three different final states depending on the decay mode of the τ leptons. The measurement in the channel with one τ lepton decaying leptonically into the electron + neutrinos (schematically τ → e + νe + ντ ) and the other one hadronically (schematically τ → hadrons + ντ ), especially the calculation of the nominal cross section and the evaluation of the systematic...
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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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