Search for the Standard Model Higgs Boson in the H ? ZZ ? l + l - qq Decay Channel at CMS

Search for the Standard Model Higgs Boson in the H ? ZZ ? l + l - qq Decay Channel at CMS

by Francesco Pandolfi


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Thetheoretical foundations of the Standard Model of elementary particlesrelies on the existence of the Higgs boson,a particle which has been revealed for the first time by the experiments run at the Large Hadron Collider (LHC) in 2012. As the Higgs boson is an unstable particle, its search strategies were based on its decay products.
In this thesis,Francesco Pandolfi conducted a search for the Higgs boson in the H → ZZ → l + l - qq Decay Channel with 4.6 fb -1 of 7 TeV proton-proton collision data collected by the Compact Muon Solenoid (CMS) experiment. The presence of jets in the final state poses a series of challenges to the experimenter: both from a technical point of view, as jets are complex objects and necessitate of ad-hoc reconstruction techniques, and from an analytical one, as backgrounds with jets are copious at hadron colliders, therefore analyses must obtain high degrees of background rejection in order to achieve competitive sensitivity. This is accomplished by following two directives: the use of an angular likelihood discriminant,capable of discriminating events likely to originate from the decay of a scalar boson from non-resonant backgrounds, and by using jet parton flavor tagging, selecting jets compatible with quark hadronization and discarding jets more likely to be initiated by gluons.
The events passing the selection requirements in 4.6 fb -1 of data collected by the CMS detectorare examined, in the search of a possible signal compatible with the decay of a heavy Higgs boson. The thesis describes the statistical tools and the results of this analysis. This work is a paradigm for studies of the Higgs boson with final states with jets. The non-expert physicists will enjoy a complete and eminently readable description of a proton-proton collider analysis. At the same time, the expert reader will learn the details of the searches done with jets at CMS.

Product Details

ISBN-13: 9783319009025
Publisher: Springer International Publishing
Publication date: 08/14/2013
Series: Springer Theses
Edition description: 2014
Pages: 128
Product dimensions: 6.10(w) x 9.25(h) x 0.02(d)

About the Author

Francesco Pandolfi, after having obtained his Laurea Triennale (2003) and Specialistica (2008) in Fisica with full grades cum laude, received his PhD from the Sapienza University of Rome in 2012 with this Thesis. Born in 1984, Rome, he has already more than 200 publications to his name. Dr Pandolfi is currently affiliated to ETH, Institute for Particle Physics, Zurich, Switzerland.

Table of Contents

Introduction.- The Hunt for the Higgs Boson.- The Large Hadron Collider and the CMS Experiment.- Jet Reconstruction and Calibration.- Event Selection.- Systematic Uncertainties.- Statistical Interpretation of Results.- Conclusions.

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