Tabla de Contenido

1. Introduction

2. The Standard Model, The LHC and ATLAS

2.1. The Standard Model
2.2. Elementary Particles

2.2.1. Fermions
2.2.2. Bosons
2.2.3. The Higgs Boson
2.2.4. Constraints on the Higgs boson mass

2.3. Unanswered Questions of the Standard Model
2.4. The Large Hadron Collider
2.5. The ATLAS detector

2.5.1. The Coordinate System
2.5.2. The Inner Detector
2.5.3. ATLAS Calorimeters
2.5.4. Muon Spectometer
2.5.5. Magnet system
2.5.6. Trigger System

3. The Electromagetic Calorimeter and Calibration Signal

3.1. Liquid Argon (LAr) Calorimetry
3.2. Calorimeter description

3.2.1. The barrel
3.2.2. The end cap

3.3. Energy resolution of the Electromagnetic Calorimeter
3.4. Electromagnetic Calorimeter Calibration

3.4.1. Description of the LAr Signal
3.4.2. Description of the Calibration Path
3.4.3. At the Read Out Driver (ROD)

4. Study of the Arrival Time of the Signal (T0)

4.1. T0 definition
4.2. Delays per FEB
4.3. Systematic V shape

5. Noise Autocorrelation Function Stability

5.1. Autocorrelation Calculation
5.2. Autocorrelation shape
5.3. Autocorrelation Stability
5.4. Bad channels identification

6. Conclusions