声明
List of Figures
List of Tables
Contents
ABSTRACT
摘要
Chapter 1 Introduction
Chapter 2 Theoretical Basis
2．1 The Stabdard Model(SM)
2．1．1 Leptons and Quarks
2．1．2 Gauge bosons and interactions
2．2 Quantum Chromodynamics(QCD)
2．2．1 Basics
2．2．2 Renormalisation and Strong Coupling Strength
2．2．3 Perturbative QCD(pQCD)
2．3 The Beyond Standard Model(BSM)
2．4 New Physics in Dijet
2．4．2 Excited W Boson(W*)
Chapter 3 The Hadron Collisions
3．1 Factorization
3．2 The Parton Density Functions(PDFs)
3．3 Hadron Collisions
Chapter 4 ATLAS experiment
4．1 CERN
4．2 LHC
4．3 Overview of the ATLAS Detector
4．4 Magnet System
4．4．1 Solenoid
4．4．2 Barrel Toroid
4．4．3 End-cap Toriod
4．5 Inner Detector
4．5．1 Pixel Detector
4．5．2 Semiconductor Tracker(SCT)
4．5．3 Transition Radiation Tracker(TRT)
4．6 Calorimetry
4．6．1 Electromagnetic Calorimeter
4．6．2 Hadronic Calorimeter
4．6．3 Forward Calorimeter
4．7 Muon Spectrometer
4．7．1 Precision Detectors(MDT and CSC)
4．7．2 Trigger Detectors(RPC and TGC)
4．8 Trigger and DAQ
4．8．1 Trigger System
4．8．2 Data Acquisition
Chapter 5 Jet
5．1 Hadronization
5．2 Jet Algorithm
5．2．1 Cone Algorithms
5．2．2 Sequential Recombination Algorithms
5．2．3 ATLAS Default Algorithm-anti-kT Algorithm
5．3 Input for Jet Algorithm on ATLAS
5．3．1 Signal Tower
5．3．2 Topological Cluster
5．4 Jet Energy Calibration at 13 TeV
5．4．1 Origin correction
5．4．2 Pile-up correction
5．4．3 Jet energy scale and η calibration
5．4．4 Global sequential calibration
5．4．5 In situ calibration methods
5．4．6 Jet energy scale uncertainty
Chapter 6 Data and Event Selection
6．1 Data Samples
6．2 Monte Carlo Samples
6．2．1 QCD Samples
6．2．2 q* Samples
6．2．3 W* Samples
6．3 Observable in Dijet Resonance Analysis-mjj
6．3．1 Detector mass resolution
6．3．2 Choosing binning
6．4 Trigger Selection
6．5 Event Selection
6．5．1 Optimization for y* cut
6．5．2 Baseline Selection
6．5．3 Specific Selection
6．6 Basic Kinematics Plots
Chapter 7 Background Estimation Strategy
7．1 The Global Fitting Method
7．2 Evolution of the background modeling function
7．3 The Sliding Window Fit(SWiFt)
Chapter 8 Systematic Uncertainties
8．1 Systematics of background
8．1．1 Uncertainties of the choice of fit function
8．1．2 Uncertainties on the parameters from the fitting function
8．2 Systematics from signals
8．2．1 Luminosity uncertainty
8．2．2 Jet energy scale uncertainty
8．2．3 PDF uncertainty
Chapter 9 SearchPhase and Limit Setting
9．1 SearchPhase
9．1．1 Frequentist p-value
9．1．2 Test Statistics
9．1．3 BumpHunter Algorithm
9．2 Limit Setting
9．2．1 Bayesian Theorem
9．2．2 Upper Limits
9．2．3 Implementation of Bayesian limits
9．2．4 Construct the likelihood function for MCMC
9．2．5 Limit calculation in dijet resonance analysis
Chapter 10 Analysis Results
10．1 Results in 2016 Analysis
10．2 Results in 2017 Analysis
Chapter 11 Conclusion and Outlook
Appendix
Bibliography
Acknowledgement
Publication
