Feasibility study for inclusive measurements of Higgs branching ratios to hadronic final states with the ATLAS detector

Angelopoulou, Athanasia - Konstantina; Αγγελοπούλου, Αθανασία-Κωνσταντίνα

dc.contributor.author	Angelopoulou, Athanasia - Konstantina	en
dc.contributor.author	Αγγελοπούλου, Αθανασία-Κωνσταντίνα	el
dc.date.accessioned	2020-09-28T11:08:53Z
dc.date.available	2020-09-28T11:08:53Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/51176
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.18874
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Higgs boson	en
dc.subject	Flavour tagging	en
dc.subject	Hadronic decays	en
dc.subject	Branching ratios	en
dc.subject	QCD background	en
dc.subject	Μποζόνιο Higgs	el
dc.subject	Flavour tagging	en
dc.subject	Αδρονικές διασπάσεις	el
dc.subject	Λόγοι διακλάδωσης	el
dc.subject	QCD background	en
dc.title	Feasibility study for inclusive measurements of Higgs branching ratios to hadronic final states with the ATLAS detector	en
heal.type	bachelorThesis
heal.classification	Physics	en
heal.language	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2020-05-29
heal.abstract	The investigation of the decay properties of the Higgs boson is an important part of the LHC physics programme. An accurate determination of the decay branching ratios to the hadronic states bb, cc, gg is necessary for studying the Higgs couplings and thus clarifying the understanding of the particle mass generation mechanism and validating the predictions of the Standard Model. At the same time, possible deviations from these values could indicate the existence of new physics. Identifying hadronic states is based on flavour tagging jets and as current methods are able to mostly identify well b-jets, the branching ratio of the Higgs boson to charm quarks has not been measured. This work studies the feasibility of doing an inclusive measurement of the Higgs hadronic branching ratios. The attempt at determining all three of them simultaneously is based on di-jet discriminants created using the response of a flavour tagging algorithm. For this to be possible, it's necessary to first extract the contribution from background processes attributed to the strong interaction. Thus, the flavour composition of the background is studied and a methodology for estimating it in the signal region is developed. This thesis shows that with the present flavour tagging accuracy, the branching ratios cannot be determined. Therefore, modifications to the output of the flavour tagging algorithm are examined. The study demonstrates the required level of efficiency and mistagging rate of flavour tagging for enabling the analysis with the goal to motivate further enhancements in the discrimination between b-, c- and light-flavour jets.	en
heal.advisorName	Gazis, Evangelos	en
heal.committeeMemberName	Glytsis, Elias	en
heal.committeeMemberName	Gazis, Evangelos	en
heal.committeeMemberName	Xanthakis, John	en
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών. Τομέας Φυσικής	el
heal.academicPublisherID	ntua
heal.numberOfPages	103 σ.	el
heal.fullTextAvailability	false