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Recherche de dimensions supplémentaires dans l'état final diphoton avec le détecteur ATLAS à 13 TeV

Abstract : In the context of particle physics, the naturalness of the Standard Model is still under discussion. In the absence of any new phenomena, the Standard Model should remain valid up to the Planck energy scale where quantum gravity plays an important role. The difference in energy between the electroweak interaction and the Planck scale is huge (17 orders of magnitude), which is known as the hierarchy problem and constitutes a naturalness issue for the Standard Model.A solution to this problem is the addition of additional space dimensions. This addition of space dimensions leads to the introduction of new particles which are graviton excitations and can decay into two photons. It might be possible toobserve graviton production at high energy colliders, especially at the LHC with the collision of proton-proton and looking at 2 photons in the final state.The diphoton analysis, with the ATLAS detector with an energy in the center of mass of 13 TeV, allows to probe a mass interval from 500 GeV to 7 TeV, where signatures of additional space dimensions, if they exist, can be studied. The main challenge of the analysis is to perform a good estimation of the SM contribution to signal. To perform this, it is necessary to discriminate true photons from misidentified jets or electronic noise. In the case of compatibility between data and the SM, this analysis allows to increase significantly the exclusion limits of the parameters of theadditional space dimensions model.
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  • HAL Id : tel-02001104, version 1

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Thomas Meideck. Recherche de dimensions supplémentaires dans l'état final diphoton avec le détecteur ATLAS à 13 TeV. Physique Nucléaire Expérimentale [nucl-ex]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAY036⟩. ⟨tel-02001104⟩

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