Measurement of Higgs Boson Production Cross Sections in the Diphoton Channel: with the full ATLAS Run-2 Data and Constraints on Anomalous Higgs Boson Interactions (Springer Theses)

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 √s = 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 → γγ and H → 4l channels using the 36 fb −1 dataset. Front Matter ....Pages i-xxiv Front Matter ....Pages 1-1 The Standard Model of Particle Physics (Ahmed Tarek Abouelfadl Mohamed)....Pages 3-35 Beyond the Standard Model : The Effective Field Theory Approach (Ahmed Tarek Abouelfadl Mohamed)....Pages 37-50 Interlude A. Statistical Analysis (Ahmed Tarek Abouelfadl Mohamed)....Pages 51-58 Front Matter ....Pages 59-59 The LHC and the ATLAS Experiment (Ahmed Tarek Abouelfadl Mohamed)....Pages 61-101 Energy Calibration of the ATLAS Electromagnetic Calorimeter with 2015 and 2016 pp Collisions (Ahmed Tarek Abouelfadl Mohamed)....Pages 103-142 Front Matter ....Pages 143-143 Interlude B. Unfolding (Ahmed Tarek Abouelfadl Mohamed)....Pages 145-160 Measurement of the Higgs Boson Fiducial Inclusive and Differential Cross Sections in the \(H\rightarrow \gamma \gamma \) Channel (Ahmed Tarek Abouelfadl Mohamed)....Pages 161-235 Higgs Boson Cross Section Interpretation Using the EFT Approach (Ahmed Tarek Abouelfadl Mohamed)....Pages 237-288 Back Matter ....Pages 291-305