Experimental Techniques in Modern High-Energy Physics: A Beginner‘s Guide

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This open access book offers a concise overview of how data from large scale experiments are analyzed and how technological tools are used in practice, as in the search for new elementary particles. It focuses on interconnects between physics and detector technology in experimental particle physics, and includes descriptions of mathematical approaches. Readers find all the important steps in analysis, including reconstruction of the momentum and energy of particles from detector information, particle identification, and also the general concept of simulating particle production from collisions and detector responses.

As the scale of scientific experiments becomes larger and data-intensive science emerges, the techniques used in the data analysis become ever more complicated, making it difficult for beginners to grasp the overall picture. The book provides an explanation of the idea and concepts behind the methods, helping readers understand journal articles on high energy physics.

This book is engaging as it does not overemphasize mathematical formalism and it gives a lively example of how such methods have been applied to the Higgs particle discovery in the Large Hadron Collider (LHC) experiments, which led to Englert and Higgs being awarded the Nobel Prize in Physics for 2013.

Graduate students and young researchers can easily obtain the required knowledge on how to start data analyses from these notes, without having to spend time in consulting many experts or digesting huge amounts of literature.

Author(s): Kazunori Hanagaki, Junichi Tanaka, Makoto Tomoto, Yuji Yamazaki
Series: Lecture Notes in Physics, 1001
Publisher: Springer
Year: 2023

Language: English
Pages: 154
City: Tokyo

Preface
Acknowledgments
Contents
About the Authors
1 Introduction
2 Basic Idea of Measurements in Particle Collisions
2.1 Observables of Particle Scattering
2.2 Cross Section and Luminosity
2.3 Identifying Processes Through Measurements of Final State Particles
2.4 Event Acceptance and Efficiency
2.5 Nature of Hadron-Hadron Collisions and Kinematic Variables
2.6 Structure of Hadrons and Parton Density Function
3 Apparatus
3.1 Particle Collisions at High Energies
3.2 Accelerator
3.3 Detector
3.3.1 Particle Interaction with Material
3.3.2 ATLAS Detector
3.3.3 Trigger
3.3.4 Optimisation of Detector Performance
4 Statistics
4.1 Uncertainty
4.1.1 Statistical Uncertainty
4.1.2 Systematic Uncertainty
4.2 Probability Distribution
4.2.1 Basics of Probability Distributions
4.2.2 Binomial Distribution
4.2.3 Poisson Distribution
4.2.4 Normal Distribution (Gaussian Distribution)
4.2.5 Uniform Distribution
4.2.6 Breit-Wigner Distribution
4.2.7 Exponential Distribution
4.2.8 χ2 (Chi-Square) Distribution
4.3 Error Propagation
4.4 Maximum Likelihood Method
4.5 Least Squares Method
4.6 Statistical Figure of Merit
4.7 Hypothesis Test
4.7.1 Discovery and Exclusion
4.7.2 Profile Likelihood Fit
4.7.3 Profile Likelihood Ratio
5 Detector Calibration
5.1 From Raw Data to Meaningful Information
5.2 Detector Alignment
5.3 Momentum Scale Calibration of Magnetic Spectrometer
5.3.1 Momentum Measurement and its Resolution
5.3.2 Momentum Scale Calibration
5.4 Energy Calibration of Calorimeter
5.4.1 Cell-by-Cell Calibration
5.4.2 Energy Cluster Calibration of Electromagnetic Shower
5.4.3 Energy Cluster Calibration of Hadronic Shower
6 Particle Identification
6.1 Tracking and Vertexing
6.1.1 Space Hit Point
6.1.2 Track Finding
6.1.3 Track Fitting
6.1.4 Vertex Finding
6.2 Electron and Photon
6.2.1 Interactions with Materials
6.2.2 Reconstruction
6.2.3 Identification
6.3 Muon
6.3.1 Muon Momentum Measurement
6.3.2 Examples of Muon Detectors
6.3.3 Muon Reconstruction
6.3.4 Muon Identification
6.3.5 Muon Isolation
6.3.6 Momentum Scale and Resolution
6.4 Jet Identification
6.4.1 Fragmentation: Partons to Particles
6.4.2 Defining Jets
6.4.3 Jet Algorithms
6.4.4 Calibrating Jet Measurements
6.5 Reconstructing Missing Momentum
6.6 Identification of b-Jet and τ-Jet
6.6.1 b-Jet
6.6.2 τ-Jet
7 Event Simulation
7.1 Overview
7.2 Event Generation
7.2.1 Production of tbart Process
7.2.2 Event Generators
7.3 Detector Simulation
8 Examples of Physics Analysis
8.1 Higgs
8.1.1 Higgs Production Mechanism in Hadron Colliders
8.1.2 H rightarrowγγ
8.1.3 Hrightarrowbbarb
8.1.4 H rightarrowWpmWmpast
8.2 Search for Physics Beyond the Standard Model
8.2.1 SUSY
8.2.2 Resonance Search
A Statistics
A.1 Binomial Distribution
A.2 Poisson's Distribution
A.3 Maximum Likelihood Method