Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC (Springer Theses) free ebook download.

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Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC (Springer Theses) free ebook download

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Author(s):	Cristina Martin Perez

Date:	2021	Format:	pdf	Language:	English	ISBN/ASIN:	3030902056
Pages:	296	OCR:		Quality:		ISBN13:
Uploader:	risotor	Upload Date:	2/23/2022 6:26:35 PM

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In this work, the interaction between the Higgs boson and the top quark is studied with the proton-proton collisions at 13 TeV provided by the LHC at the CMS detector at CERN (Geneva).
At the LHC, these particles are produced simultaneously via the associate production of the Higgs boson with one top quark (tH process) or two top quarks (ttH process). Compared to many other possible outcomes of the proton-proton interactions, these processes are very rare, as the top quark and the Higgs boson are the heaviest elementary particles known. Hence, identifying them constitutes a significant experimental challenge. A high particle selection efficiency in the CMS detector is therefore crucial. At the core of this selection stands the Level-1 (L1) trigger system, a system that filters collision events to retain only those with potential interest for physics analysis. The selection of hadronically decaying  leptons, expected from the Higgs boson decays, is especially demanding due to the large background arising from the QCD interactions. The first part of this thesis presents the optimization of the L1  algorithm in Run 2 (2016-2018) and Run 3 (2022-2024) of the LHC. It includes the development of a novel trigger concept for the High-Luminosity LHC, foreseen to start in 2027 and to deliver 5 times the current instantaneous luminosity. To this end, sophisticated algorithms based on machine learning approaches are used, facilitated by the increasingly modern technology and powerful computation of the trigger system.
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