Search for double-Higgs boson production in the bb+2 photon final state for the measurement of the Higgs boson self-coupling and prospects for Higgs boson coupling studies to quarks and gluons at future colliders


The main subject of this thesis is the analysis of the Run3 data of the ATLAS experiment at the Large Hadron Collider at CERN for the search of the production of two Higgs bosons for the measurement of its self-coupling. 
The thesis will focus on the search of the production of two Higgs bosons (decaying in bb + two photons) with the ATLAS data from Run3 of the LHC (2022–2025), with an optimization of the sensitivity of the analysis in function of new data taking conditions compared to Run2 and the use of multivariate analysis techniques to maximize the separation between signal and background. Although it is not expected that the observation of this process can be carried out with the data of Run3, some initial evidence might be reached with the larger dataset and improved analysis techniques of Run3 compared to Run2. The measurement will anyway make it possible to put constraints on the self-coupling of the Higgs boson and on models of physics beyond the Standard Model.
In addition, the candidate will contribute to the ongoing feasibility and R&D studies on FCC-ee. Sensitivity studies to the measurement of Higgs boson couplings to quarks and gluons in future e+e- colliders and their comparison with ATLAS projections for the high-luminosity phase of the LHC will be performed. These benchmark Higgs processes will be used to compare the performance of different detector designs and layout.

More details in the attached pdf file.








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