Measurement of Higgs Boson Production Cross Sections in the Diphoton Channel

This thesis presents the measurement of the Higgs boson cross section in the diphoton decay channel. The measurement relies on proton-proton collision data at a center-of-mass energy vs = 13 TeV recorded by the ATLAS experiment at the Large Hadron Collider (LHC). The collected data correspond to the full Run-2 dataset with an integrated luminosity of 139 fb-1. The measured cross sections are used to constrain anomalous Higgs boson interactions in the Effective Field Theory (EFT) framework. The results presented in this thesis represent a reduction by a factor 2 of the different photon and jet energy scale and resolution systematic uncertainties with respect to the previous ATLAS publication. The thesis details the calibration of electron and photon energies in ATLAS, in particular the measurement of the presampler energy scale and the estimation of its systematic uncertainty. This calibration was used to perform a measurement of the Higgs boson mass in the H and H 4l channels using the 36 fb-1 dataset.

Inhalt
Theory.- Beyond the Standard Model : The Effective Field Theory Approach.- The LHC and the ATLAS Experiment.- Energy Calibration of the ATLAS Electromagnetic Calorimeter with 2015 and 2016 pp Collisions.- Measurement of the Higgs Boson Fiducial Inclusive and Differential Cross Sections in the Higg Channel.- Higgs Boson Cross Section Interpretation Using the EFT Approach .- Conclusions.