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
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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.

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ReiheSpringer Theses
ISBN 9783030595180
Ausgabe 1st ed. 2020
Erscheinungsdatum 13.11.2021
Umfang 305 Seiten
Genre Physik, Astronomie/Atomphysik, Kernphysik
Format Taschenbuch
Verlag Springer International Publishing