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Observation of a BEH-like boson decaying into two photons with the ATLAS detector at the LHC

Abstract : In this thesis, I show my contribution to the observation of a new boson at the Large Hadron Collider with the ATLAS detector in the diphoton decay channel. This boson is compatible with the long-searched scalar boson of the Standard Model and has a mass of 126.0+/-0.4+/- 0.4 (sys) GeV obtained when combining the decay channels gamma gamma and ZZ. The data used were collected in the ATLAS experiment during 2011 with a center-of-mass energy of 7 TeV and during the first three months of the 2012 run with a center-of-mass energy of 8 TeV. The total corresponding luminosity is about 10 fb-1. The observed excess has a local significance of 4.5 sigma in the gamma gamma channel and has a significance of 5.9 sigma when combining all the channels used in the analysis. Moreover, diverse contributions to the H into gamma gamma analyses of the data from 2009 to 2012 are also shown.
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https://tel.archives-ouvertes.fr/tel-00744847
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Submitted on : Wednesday, October 24, 2012 - 9:42:42 AM
Last modification on : Wednesday, September 16, 2020 - 4:54:37 PM
Long-term archiving on: : Friday, January 25, 2013 - 3:42:10 AM

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VA_ANDARI_NANSI_26092012.pdf
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  • HAL Id : tel-00744847, version 1

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Nansi Andari. Observation of a BEH-like boson decaying into two photons with the ATLAS detector at the LHC. Other [cond-mat.other]. Université Paris Sud - Paris XI, 2012. English. ⟨NNT : 2012PA112191⟩. ⟨tel-00744847⟩

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