Multivariate analysis methods in the search for the Higgs boson produced in association with top pairs at the ATLAS experiment at LHC.

Ucchielli, Giulia (2014) Multivariate analysis methods in the search for the Higgs boson produced in association with top pairs at the ATLAS experiment at LHC. [Laurea magistrale], Università di Bologna, Corso di Studio in Fisica [LM-DM270]
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Abstract

The Large Hadron Collider, located at the CERN laboratories in Geneva, is the largest particle accelerator in the world. One of the main research fields at LHC is the study of the Higgs boson, the latest particle discovered at the ATLAS and CMS experiments. Due to the small production cross section for the Higgs boson, only a substantial statistics can offer the chance to study this particle properties. In order to perform these searches it is desirable to avoid the contamination of the signal signature by the number and variety of the background processes produced in pp collisions at LHC. Much account assumes the study of multivariate methods which, compared to the standard cut-based analysis, can enhance the signal selection of a Higgs boson produced in association with a top quark pair through a dileptonic final state (ttH channel). The statistics collected up to 2012 is not sufficient to supply a significant number of ttH events; however, the methods applied in this thesis will provide a powerful tool for the increasing statistics that will be collected during the next LHC data taking.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Ucchielli, Giulia
Relatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum B: Fisica nucleare e subnucleare
Ordinamento Cds
DM270
Parole chiave
Higgs boson, statistics, multivariate methods, ATLAS
Data di discussione della Tesi
24 Ottobre 2014
URI

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