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Searches for supersymmetric particles in final states with multiple top and bottom quarks with the Atlas detector

This PhD thesis documents two of the highest-profile searches for supersymmetry performed at the ATLAS experiment using up to 80/fb of proton-proton collision data at a center-of-mass energy of 13 TeV delivered by the Large Hadron Collider (LHC) during its Run 2 (2015-2018). The signals of interest...

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Main Author: Rizzi, Chiara, 1976-
Other Authors: SpringerLink (Online service)
Format: eBook
Language: English
Published: Cham : Springer, 2020.
Physical Description: 1 online resource (284 pages).
Series: Springer theses.
Subjects:
Particles (Nuclear physics)
Supersymmetry.
Quantum field theory.
Mathematical physics.
Electronic books.
Table of Contents:
  • Intro
  • Supervisor's Foreword
  • Abstract
  • Acknowledgements
  • Contents
  • Acronyms
  • 1 Preamble
  • 2 Introduction to Standard Model and Supersymmetry
  • 2.1 The Standard Model of Particle Physics
  • 2.1.1 Particle Content of the Standard Model
  • 2.1.2 Interactions and Gauge Invariance
  • 2.1.3 Strong Interaction
  • 2.1.4 Electroweak Interaction and Higgs-Englert-Brout Mechanism
  • 2.1.5 Measured Properties of the Higgs Boson
  • 2.2 Limitations of the Standard Model and How to Extend It
  • 2.2.1 Unexplained Phenomena
  • 2.2.2 Aesthetic Shortcomings.
  • 2.2.3 Extensions of the Standard Model
  • 2.3 Supersymmetry
  • 2.3.1 Supermultiplets
  • 2.3.2 Minimal Supersymmetric Standard Model
  • 2.3.3 Natural SUSY
  • 2.3.4 SUSY Breaking in the MSSM
  • 2.3.5 SUSY-Breaking Mechanisms
  • 2.3.6 Phenomenological MSSM
  • References
  • 3 LHC and ATLAS
  • 3.1 The Large Hadron Collider
  • 3.1.1 A Circular Hadron Collider
  • 3.1.2 Magnet System
  • 3.1.3 Resonant Cavities
  • 3.1.4 Luminosity and Operational Parameters
  • 3.1.5 Accelerator Complex
  • 3.1.6 Experiments at the LHC
  • 3.2 Detectors for Collider Physics
  • 3.2.1 Identification of Particles.
  • 3.2.2 Tracking and Spectrometry
  • 3.2.3 Calorimetry
  • 3.2.4 Detecting Photons
  • 3.3 The ATLAS Experiment
  • 3.3.1 Coordinate System
  • 3.3.2 Magnet System
  • 3.3.3 Inner Detector
  • 3.3.4 Calorimeters
  • 3.3.5 Muon Spectrometer
  • 3.3.6 Luminosity Measurement
  • 3.3.7 Trigger System
  • 3.3.8 ATLAS Operation
  • References
  • 4 Proton-Proton Interactions and Their Simulation
  • 4.1 Proton-Proton Interactions
  • 4.1.1 Factorization Theorem
  • 4.1.2 Parton Density Functions
  • 4.2 Event Simulation
  • 4.2.1 Matrix Element
  • 4.2.2 Parton Shower
  • 4.2.3 Matching
  • 4.2.4 Hadronization.
  • 4.2.5 Underlying Event
  • 4.2.6 Pileup
  • 4.3 Monte Carlo Generators
  • 4.3.1 General Purpose Generators
  • 4.3.2 Matrix Elements Generators
  • 4.3.3 Specialized Generators
  • 4.4 Detector Simulation
  • References
  • 5 Event Reconstruction
  • 5.1 Tracks and Primary Vertices
  • 5.2 Jets
  • 5.2.1 Clusters
  • 5.2.2 Jet-Finding Algorithms
  • 5.2.3 Jet Calibration
  • 5.2.4 Jet Vertex Tagger
  • 5.2.5 Jet Cleaning
  • 5.2.6 Re-clustered Jets
  • 5.3 Jets from B-Hadrons
  • 5.3.1 B-Tagging Calibration and Uncertainties
  • 5.4 Muons
  • 5.4.1 Muon Reconstruction
  • 5.4.2 Muon Identification.
  • 5.4.3 Muon Efficiency Measurement
  • 5.4.4 Muon Isolation
  • 5.4.5 Muon Momentum Calibration
  • 5.5 Electrons
  • 5.5.1 Electron Reconstruction
  • 5.5.2 Electron Identification
  • 5.5.3 Electron Isolation
  • 5.5.4 Electron Efficiency Measurement
  • 5.5.5 Electron Energy Scale and Resolution
  • 5.6 Missing Transverse Momentum
  • References
  • 6 Statistical Methods
  • 6.1 Statistical Inference
  • 6.2 Parameter Estimation
  • 6.2.1 Estimators
  • 6.2.2 The Maximum Likelihood Estimator
  • 6.2.3 Binned Likelihood Fit with Systematic Uncertainties
  • 6.2.4 Profiled Likelihood Ratio.

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