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Sipica, Valentin: Prospects for measuring the branching ratio of the rare B 0 s my + my - decay with the ATLAS experimentPerspektiven der Messung der Zerfallsrate des seltenen Zerfalls B 0 s my + my - mit dem ATLAS-Experiment. 2011
Inhalt
Abstract
Contents
Introduction
Rare Decays of B-Mesons in Theory and Experiment
Standard Model of Particle Physics
Bs(d)0 +- in the Standard Model
Bs0 +- in New Physics Models
Experimental Evidence
The ATLAS Experiment
The Large Hadron Collider
The ATLAS Detector
ATLAS Conventions
Magnet System
Inner Detector
Calorimeters
Muon Spectrometer
Luminosity Determination at ATLAS
Trigger System
First Level Trigger
Second Level Trigger
Event Filter
ATLAS Computing Infrastructure
The Strategy for the Study of Rare Leptonic B Decays
General Overview
Decay Channels Investigated
Signal Channel
Reference Channel
Background Channels Investigated
Exclusive Channels
Combinatorial Background
Trigger Strategy
First Level Trigger
Second Level Trigger
Event Filter
Trigger Chains
Data Samples
Monte Carlo Production
Review of Data Samples
Event Generation
MC Truth Event Selection
MC Truth Level Kinematic Variables
Cross-Section Calculations
Event Simulation
Digitisation
Event Reconstruction
Study of the Acceptance Ratio
Procedure for Determining the Acceptance Ratio
b-quark Fragmentation Ratio
Determining the Cross Section Ratio
Trigger Studies
Trigger Efficiency Determination
Trigger Efficiency as a Function of Kinematic Variables
Alternative Trigger Scenarios
Offline Event Selection
Reconstruction of Bs0 and B+ Candidates
Bs0 Finding Algorithm
B+ Finding Algorithm
Candidate Yield
Trigger Selection
Baseline Selection
Selection of Bs0 Candidates
Selection of B+ Candidates
Baseline Selection Yield
Cut Based Selection
Transverse Decay Length
Pointing Angle
Bs0 Isolation
Invariant Mass
Event Selection in the Reference Channel
Lxy, and IK Selection
Invariant Mass
Determination of Efficiencies
Trigger Efficiency
Reconstruction Efficiency
Baseline Selection Efficiency
Cut Selection Efficiency
Summary of Efficiency Calculation
Analysis of the Background Sample
Search for Bs0 +-
Selection of B+ J/K+
Prospects for Measuring the Bs0 +- Branching Ratio
Exclusion Limit Calculation
A Bayesian Approach
The Feldman Cousins Unified Approach
Monte Carlo Limit on the Branching Ratio
Upper Limit Estimates on the Branching Ratio
Cut Optimisation
Sensitivity to the Bs0 +-Branching Ratio
Summary
Summary
Kinematic Truth Variables of Generated Data Samples
Correlations between pT() and
Kinematic Variables of Generated Particles
Kinematic Variables Used in the Acceptance Studies
b-quark Fragmentation Ratio
Estimating Systematic Uncertainties due to Correlations Between Selection Variables
Procedure for Determining Uncertainties
Preserving the Correlations
Transformation to a Gaussian Shape
Toy Monte Carlo Simulation
Efficiency Study
Upper Limit on the Bs0 +- Branching Ratio as a Function of the Integrated Luminosity
List of Figures
List of Tables
Bibliography
Acknowledgment