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Etude des résonances de la famille du Upsilon dans les collisions d'ions lourds ultra-relativistes à 2.75 TeV/nucléon et par faisceau dans le cadre de l'expérience ALICE au CERN

Abstract : The Quantum Chromodynamics foresee, at high temperature and/or high energy density, a phase transition between hadronic matter and a phase where quarks and gluons are no more confined in the nucleons: the Quark Gluon Plasma (QGP). During the past fifteen years, a large experimental program has taken place at CERN and at BNL, to identify the QGP. ALICE is the LHC experiment dedicated to the study of the plasma via ultrarelat ivistic heavy ion collisions at 2.75 TeV/nucleon per beam. The measure of Upsilon's resonances suppression, a powerfull signature of a deconfined medium, with the ALICE dimuon spectrometer, is the main topic of this thesis. The first part of the work aims at studying the multiwires pad chambers of the dimuon arm, used to track the muons from resonances decays. The second part presents an in-beam alignment algorithm able to calculate the positions of the different chambers with a very good accuracy. Finally, the last part proposes a study to lead with the ALICE muon spectrometer, involving the measure of Upsilon and Upsilon' production ratio as a function of the transverse momentum. It has been showed that this study should allow to evidence the QGP and to extract some of its properties.
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https://tel.archives-ouvertes.fr/tel-00009493
Contributor : Eric Dumonteil <>
Submitted on : Thursday, August 4, 2005 - 12:54:01 PM
Last modification on : Monday, February 10, 2020 - 6:12:41 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:34:26 PM

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  • HAL Id : tel-00009493, version 1

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Eric Dumonteil. Etude des résonances de la famille du Upsilon dans les collisions d'ions lourds ultra-relativistes à 2.75 TeV/nucléon et par faisceau dans le cadre de l'expérience ALICE au CERN. Physique des Hautes Energies - Expérience [hep-ex]. Université de Caen, 2004. Français. ⟨tel-00009493⟩

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