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Optimisation du détecteur ATLAS pour la recherche du boson de Higgs se désintegrant en deux photons au LHC

Abstract : The decay mode into a pair of photons is the cleanest way to find a Higgs boson with intermediate mass of great future proton collider at CERN, the LHC. Since the natural width of the Higgs is very narrow in this area, its observation in this channel is based on the performance of the electromagnetic calorimeter. A comprehensive study was conducted to evaluate the discovery potential of ATLAS detector. The parameters and geometry of liquid argon electromagnetic calorimeter has been optimized. The simulation results used for this work are confirmed by tests on a prototype beam. This simulation includes different contributions as the end of sampling, electronic sounds and stacking, the total constant term of the calorimeter and measuring the direction of the photon emission angle of the pair. The level of background noise irreducible pairs of direct photons was evaluated, as is the background noise reducible jets of hadrons, particularly that of the isolated neutral pions. For this, the detector's ability to reject these background noise was estimated. The calculation of the invariant mass resolution of photon pairs and the estimated rate of signal events and background noise were used to calculate the Higgs discovery potential of the ATLAS detector for this channel. A systematic effect more than five standard deviations will be highlighted in a year of data taking at the LHC if the Higgs boson mass is 100 GeV/c2 and 150 GeV/c2.
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Contributor : Vincent Tisserand <>
Submitted on : Wednesday, December 8, 2010 - 5:35:08 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:20 PM
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  • HAL Id : tel-00544731, version 1




Vincent Tisserand. Optimisation du détecteur ATLAS pour la recherche du boson de Higgs se désintegrant en deux photons au LHC. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris Sud - Paris XI, 1997. Français. ⟨tel-00544731⟩



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