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Hosokawa, Ritsuya
Universite Grenoble Alpes, Ecole Doctorale de Physique, Laboratoire de Physique Subatomique et de Cosmologie (France); University of Tsukuba, Graduate School of Pure and Applied Sciences, Tomonaga Center for the History of the Universe (Japan)2019
Universite Grenoble Alpes, Ecole Doctorale de Physique, Laboratoire de Physique Subatomique et de Cosmologie (France); University of Tsukuba, Graduate School of Pure and Applied Sciences, Tomonaga Center for the History of the Universe (Japan)2019
AbstractAbstract
[en] In this thesis, two complementary aspects of jet measurements with the ALICE detector at the LHC were studied. First, the upgrade of the ALICE electromagnetic calorimeter trigger system is presented. The Di-jet Calorimeter (DCal) has been installed during LHC Long Shutdown 1 (LS1) to extend the azimuthal coverage of the existing Electromagnetic Calorimeter (EMCal) and Photon Spectrometer (PHOS). The trigger system has been upgraded to account for this new detector configuration. The firmware for the Summary Trigger Unit (STU), which is the electronics of the trigger system, was upgraded to implement a brand new algorithm combining information from the calorimeters. Second, the measurement of the production cross section of charged jets reconstructed with cone resolution parameter R = 0.2, 0.3, 0.4, and 0.6 in pp collisions at √(s) = 5.02 TeV is outlined. A comparison of the production cross section to LO and Next-Leading-Order (NLO) pQCD predictions is shown. Good agreement of the production cross section with NLO pQCD calculations is found for 10 < pchTjet < 100 GeV/c. The measurement of charged jet v2 in mid-central (30-50%) Pb-Pb collisions at √(sNN) = 5.02 TeV is also presented. The results are compared with a toy-model Glauber simulation based on the measured path-length dependence of jet suppression. Finally, the measurement of charged jet-hadron correlations in mid-central (30-50%) Pb-Pb collisions at √(sNN) = 5.02 TeV with respect to the 2. order event plane is also presented in order to study initial collision geometry dependence of jet modification in Pb-Pb collisions. (author)
[fr]
Dans cette these, deux aspects complementaires de la mesure des jets a l'aide du detecteur ALICE ont ete etudies. D'une part, l'amelioration du systeme de declenchement calorimetrique de l'experience ALICE est presentee. Le Calorimetre Di-jet (DCal) a ete installe pendant le premier arret long du LHC (LS1) afin d'etendre la couverture azimutale de l'existant Calorimetre ElectroMagnetique (EMCal) et Spectrometre a PHOtons (PHOS). Cette mise a jour a consiste a tenir compte de cette nouvelle configuration des detecteurs. Un nouveau micrologiciel de la carte electronique Summary Trigger Unit (STU) du syteme de declenchement calorimetrique implementant un algorithme original combinant les informations des trois calorimetres a ete developpe. D'autre part, la mesure de la section efficace de production de jets charges reconstruits avec differentes resolutions R = 0.2, 0.3, 0.4 et 0.6 en collisions pp a l'energie de 5.02 TeV est presentee. La comparaison de la section efficace mesuree avec les predictions de la pCDQ a l'ordre sous-dominant (NLO) montre une bonne adequation dans la region 10 < pchTjet < 100 GeV/c. La mesure du v2 des jets charges dans les collisions Pb-Pb semi-centrales (30-50%) a l'energie de 5.02 TeV est egalement exposee dans cette these. Les resultats obtenus ont ete compares a une simulation rapide basee sur le modele de Glauber tenant compte de la dependance de la suppression des jets selon leur longueur de parcours dans le milieu. Enfin, la mesure des correlations entres jets charges et hadrons dans les collisions Pb-Pb semi-centrales (30-50%) a l'energie de 5.02 TeV est presentee dans le but d'etudier la dependance de la modification des jets en fonction de la geometrie de la collisions Pb-Pb. (auteur)Original Title
Mesure des proprietes des jets dans les collisions pp et Pb-Pb a 5.02 TeV avec l'experience ALICE aupres du LHC
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29 Mar 2019; 167 p; 94 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; These Docteur de la Communaute Universite Grenoble Alpes, Specialite: Physique Subatomique et Astroparticules
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