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Confronting heavy-ion models with experimental data from LHC
 Lelák, Emil ; Rybář, Martin (advisor) ; Poláček, Stanislav (referee)
The purpose of heavy-ion physics is to study the properties of strong interaction and matter under the extreme conditions that prevailed within a few millionths of a second after the Big Bang. These extreme conditions can be created when two relativistic heavy ions collide and a special matter called quark-gluon plasma is formed. The thesis deals with confronting models of proton-proton and heavy-ion collisions with experimental data from LHC. The thesis starts with the definition of basic kinematic quantities. Then, the facts about the LHC and the ATLAS experiment are provided. In the next part, the physics background concerning jets and the quark-gluon plasma is explained. Conse- quently, the description of used Monte Carlo simulations - PYTHIA 8 for proton-proton and JEWEL for heavy-ion collisions is provided. The important part of the thesis was to implement an analysis within the Rivet framework, which is described in the next part of the thesis. The implemented analysis was applied to data from simulations and the resulting distributions were compared to experimental data. As to results, PYTHIA 8 can describe well experimental jet spectra in proton-proton collisions. However, JEWEL does not describe heavy-ion collisions well, which is shown by the significant suppression of the jet spectrum from the...
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