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Recherche du boson de Higgs dans le canal diphoton au LHC avec le détecteur ATLAS

Abstract : The goal of this thesis is the preparation of the Higgs boson search in its diphoton decay at LHC with the ATLAS detector.

The issues that have been studied deal with the Higgs to two photons vertex reconstruction, with the electromagnetic calorimeter and the inner detector, and the diphoton invariant mass resolution.Different simulations of the ATLAS detector and the effects of additional material and of detector misalignements have been studied.

Issues concerning the statistical significance calculation have also been discussed and the discovery potential has been evaluated.

A part if this thesis is done with CSC data, that use the most recent detector simulation and new reconstruction methods. Every step of the signal and background treatment has been discussed. We finally evaluate that with an integrated luminosity of 10-1 we will be able to see a Higgs to two photons signal with a statistical significance of 3 sigma.
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Contributor : Koletsou Iro <>
Submitted on : Thursday, July 3, 2008 - 4:09:52 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:20 PM
Long-term archiving on: : Monday, October 1, 2012 - 10:50:13 AM


  • HAL Id : tel-00293103, version 1




Iro Koletsou. Recherche du boson de Higgs dans le canal diphoton au LHC avec le détecteur ATLAS. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00293103⟩



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