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Measurement of the WbWb cross-section in the dilepton channel using classical and quantum computing techniques with the ATLAS detector at the LHC

Year: 2025
Type: dissertation
Abstract: The top quark is the heaviest known elementary particle of the Standard Model. Thanks to its particular properties, it allows to explore unique physics domains, inaccessible otherwise: one of them is the $WbWb$ production from proton-proton collisions. Studying this process is very important for a better knowledge of the Standard Model, but also to investigate some Beyond the Standard Model phenomena. In this work, the first ever measurement of the fiducial differential cross-sections of the $WbWb$ production in the dilepton channel is provided. The measurement is performed using the full dataset collected by the ATLAS detector from proton-proton collisions at the LHC during Run-2 at $\sqrt{s}=\SI{13}{\tera\electronvolt}$ corresponding to an integrated luminosity of $\SI{140}{\femto\barn^{-1}}$. The differential cross-sections have been measured as a function of kinematic variables characterizing the $WbWb$ final states and one $t\bar{t}/tW$ interference-sensitive variable, defined as $m_{bl}^{\text{minimax}}$. The results are then compared to several Monte Carlo predictions. We have also developed a novel unfolding method based on quantum annealing, along with a dedicated software tool, called \texttt{QUnfold}. Our implementation is the first LHC-size data analysis software capable of using quantum computation to solve the unfolding problem and therefore to measure differential cross-sections of particle physics processes. We successfully tested it on the $WbWb$ ATLAS data used for the main analysis of this work.
DOI: 10.48676/unibo/amsdottorato/12039
Language: English
Open Access status: green
OpenAlex ID: W7077274882
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