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Produkce jetů s velkou příčnou hybností na LHC
Podškubka, Radek ; Kupčo, Alexander (advisor) ; Lysák, Roman (referee)
In the first part of the thesis, theoretical uncertainties of jet cross-section have been calculated for proton-proton collision at the center of mass energy of 8 TeV. For jet identification the anti-kT algorithm with scale parameter R = 0.6 was used. As the calculations showed, the major contribution to the total theoretical uncertainty comes from the uncertainty of parton distribution function parameters. In the second part of the thesis, the angular distribution of dijet events produced in proton-proton collisions at the center of mass energy 8 TeV were simulated using Pythia 8 Monte Carlo event generator. New physics model of quark compositeness that should manifest itself by quark contact interaction was studied using angular distribution of dijet events. Three angular variables were discussed and these variables were used to calculate 95% CL lower limit on contact interaction scale. The results were compared and it emerged that the sensitivity to contact interaction signals varies for these variables.
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Analýza dlouhodobého vývoje jasu noční oblohy na Observatoři Pierre Augera
Podškubka, Radek ; Prouza, Michael (advisor) ; Trávníček, Petr (referee)
In this paper we compare night sky brightness at the Pierre Auger Observatory with the flux of the solar extreme UV radiation. The night sky brightness is measured for monitoring purposes during operation of fluorescence detectors. The data were processed several times under slightly different conditions that should exclude the impact of moonlight, artificial light pollution and cloudiness. If one does not consider the effects mentioned before, the main source of night sky brightness is an airglow. The goal is to show that night sky brightness correlates with the flux of solar extreme UV radiation, what will confirm that extreme UV radiation is the cause of the airglow origin.
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Produkce jetů s velkou příčnou hybností na LHC
Podškubka, Radek ; Kupčo, Alexander (advisor) ; Lysák, Roman (referee)
In the first part of the thesis, theoretical uncertainties of jet cross-section have been calculated for proton-proton collision at the center of mass energy of 8 TeV. For jet identification the anti-kT algorithm with scale parameter R = 0.6 was used. As the calculations showed, the major contribution to the total theoretical uncertainty comes from the uncertainty of parton distribution function parameters. In the second part of the thesis, the angular distribution of dijet events produced in proton-proton collisions at the center of mass energy 8 TeV were simulated using Pythia 8 Monte Carlo event generator. New physics model of quark compositeness that should manifest itself by quark contact interaction was studied using angular distribution of dijet events. Three angular variables were discussed and these variables were used to calculate 95% CL lower limit on contact interaction scale. The results were compared and it emerged that the sensitivity to contact interaction signals varies for these variables.
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|
|
Analýza dlouhodobého vývoje jasu noční oblohy na Observatoři Pierre Augera
Podškubka, Radek ; Prouza, Michael (advisor) ; Trávníček, Petr (referee)
In this paper we compare night sky brightness at the Pierre Auger Observatory with the flux of the solar extreme UV radiation. The night sky brightness is measured for monitoring purposes during operation of fluorescence detectors. The data were processed several times under slightly different conditions that should exclude the impact of moonlight, artificial light pollution and cloudiness. If one does not consider the effects mentioned before, the main source of night sky brightness is an airglow. The goal is to show that night sky brightness correlates with the flux of solar extreme UV radiation, what will confirm that extreme UV radiation is the cause of the airglow origin.
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