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

Format:

Book

Author/Creator:

Pandolfi, Francesco

Series:

Springer theses

Springer Theses

Language:

English

Subjects (All):

Higgs bosons--Decay.

Higgs bosons.

Physical Description:

1 online resource

Place of Publication:

Dordrecht Springer 2013

Summary:

The theoretical foundations of the Standard Model of elementary particles relies 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 --> ℓℓ⁻ qq̄ 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 detector are 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

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

Notes:

Print version record

Includes bibliographical references

Other Format:

Print version:

ISBN:

9783319009032

3319009036

OCLC:

859749874

Access Restriction:

Restricted for use by site license