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Prospects of a cross section ratio measurement of W and Z events as a function of the jet multiplicity with early ATLAS data / von Marisa Sandhoff. 2010
Content
Introduction
Physical context
The Standard Model of particle physics
The strong interaction
The electroweak interaction
The top quark
top quark pair production
top quark pair decay
top quark mass
single top quark production
Experimental particle physics
LHC and ATLAS
Particle accelerators and collision experiments
Short overview of recent experiments in high energy physics
Large Hadron Collider (LHC)
ATLAS Experiment
Inner Detector
Calorimeter System
Muon System
Trigger
Luminosity
Data processing
Object identification and reconstruction
Tracks
Electrons and photons
Electrons
Photons
Jets
ATLAS jet clustering
Jet reconstruction algorithms
Jet calibration
b jet identification
Muons
-leptons
Neutrinos (missing transverse energy)
Data simulation
Simulation of the events
Simulation of the detector
Jet algorithms
ATLAS jet algorithms
Event selection
Matching of quark - particle jet - calorimeter jet
Jet energy
Effects from both fragmentation and measurement
Effects from fragmentation and measurement separately
Angular resolution
Influence of pile up on energy resolution
b-tagging
The standard ATLAS IP3D+SV1 algorithm
Testing t reference histograms
Summary
Motivation of measuring W+jets/Z+jets
Top quark analysis
W and Z events
Final State
Initial State
Masses
Couplings
Summary
W and Z event shapes
Event selection
Expected differences in W and Z events
Similarities of W and Z events
Z+jets to estimate W+jets
Summary
Ratio W+jets/Z+jets
Strategy of the measurement
Data samples
Event selection
Trigger
Selection of W and Z events
W and Z event selection results
Jet definition and selection
W+jets and Z+jets event selection results
Nomenclature
Background subtraction
Additive background (mostly QCD and t )
Multiplicative background (W/Z el,l, l)
Ratio measurement
Statistical results
Systematic uncertainties
Jet energy scale and resolution
Electron energy scale and resolution
E-.1ex/T energy scale and resolution
Background estimate
QCD background estimate
W -3.45mu Z migrations
Combined systematic uncertainty
Results
Unfolded ratio W+jets/Z+jets
Correcting detector effects
Migrations of events
Reversing the migrations: Unfolding
Unfolding based on Bayes` Theorem
Testing the unfolding method
Model dependence of the migration matrix
Summary
Strategy of the measurement
Statistical unfolded results
Pseudo experiments
Final statistical results
Systematic uncertainties
Model - calculation of the migration matrix
Combined systematic uncertainties
Signal efficiency
Results
Summary and Outlook
References