Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Hamburg
DESY
2011
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | IV, 178 S. graph. Darst. |
Internformat
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| 245 | 1 | 0 | |a Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |c vorgelegt von Gordon Fischer |
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Datensatz im Suchindex
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| adam_text | IMAGE 1
CONTENTS
1 INTRODUCTION 1
2 THEORETICAL ASPECTS 3
2.1 THE INTERACTIONS IN THE STANDARD MODEL 3
2.2 THE HIGGS MECHANISM 7
2.3 THE LIMITS OF THE STANDARD MODEL 8
2.4 SUPERSYMMETRY 9
3 THE LARGE HADRON COLLIDER AND THE ATLAS DETECTOR 11
3.1 THE LARGE HADRON COLLIDER 11
3.2 THE ATLAS DETECTOR 14
3.2.1 THE INNER DETECTOR 15
3.2.2 THE CALORIMETER SYSTEM 17
3.2.3 THE MUON SPECTROMETER 19
3.2.4 THE MAGNETIC FIELD 20
3.3 DETECTOR PERFORMANCE WITH COLLISION DATA 21
4 DATA TAKING AND TRIGGER PERFORMANCE AT ATLAS 25
4.1 MONTE CARLO GENERATION AND DETECTOR SIMULATION 25
4.2 DATA TAKING AT ATLAS 27
4.3 THE ATLAS TRIGGER 28
4.4 THE GENERAL TRIGGER STRUCTURE 28
4.5 LVL1 TRIGGER 29
4.6 THE HIGH LEVEL TRIGGER 32
4.6.1 LVL2 TRIGGER 33
4.6.2 EVENT FILTER TRIGGER 33
4.7 MONITORING OF THE TRIGGER SYSTEM 34
4.7.1 GENERAL ASPECTS OF TRIGGER MONITORING 34
4.8 THE TAU TRIGGER 36
4.8.1 TAU TRIGGER PERFORMANCE FOR ^/S = 7 TEV DATA 37
5 GENERAL ASPECTS OF THE PP - Z + X -* TT ANALYSIS 39
5.1 Z-BOSON PRODUCTION AT A PROTON-PROTON COLLIDER 39
5.1.1 TOPOLOGY OF PROTON PROTON COLLISIONS 39
I
BIBLIOGRAFISCHE INFORMATIONEN HTTP://D-NB.INFO/101710087X
DIGITALISIERT DURCH
IMAGE 2
CONTENTS
5.2 THE PHYSICS OF THE Z-BOSON 41
5.3 PHYSICS OF THE R-LEPTON 44
5.3.1 INCLUSIVE DECAYS 45
5.3.2 EXCLUSIVE LEPTONIC DECAYS 45
5.3.3 EXCLUSIVE HADRONIC DECAYS 45
5.3.4 THE R-NEUTRINO 47
5.3.5 SPIN POLARISATION .* 47
5.4 THE CONTRIBUTION OF THE Z-BOSON AND THE -R-LEPTON IN CONTEXT OF THE
STANDARD MODEL 48
5.4.1 THE R-LEPTON AS THE FINAL STATE FOR THE HIGGS BOSON 48
5.4.2 THE R-LEPTON AS THE FINAL STATE FOR SUPERSYMMETRIC SCENARIOS 49
6 TAU LEPTON RECONSTRUCTION AND IDENTIFICATION 51
6.1 EVENT CLEANING AND LEPTON SELECTION 51
6.1.1 RECONSTRUCTION AND IDENTIFICATION OF ELECTRON CANDIDATES 52 6.1.2
RECONSTRUCTION AND IDENTIFICATION OF MUON CANDIDATES . . 52 6.2 TAU
LEPTON SELECTION 52
6.2.1 RECONSTRUCTION OF TAU CANDIDATES 55
6.2.2 IDENTIFICATION OF TAU CANDIDATES 56
6.3 FAKE RATES FROM QCD DI-JET SAMPLES AND FROM THE W+JETS EVENTS 60
7 Z - TT OBJECT SELECTION 65
7.1 EVENT PRE-SELECTION 69
7.2 THE OBJECT PRE-SELECTION 70
7.3 THE OBJECT SELECTION 72
7.4 LEPTON ISOLATION 73
7.5 TRANSVERSE MISSING ENERGY E* ISS 75
7.6 EVENT SELECTION 78
7.7 BACKGROUND ESTIMATION 81
7.7.1 OS-SS ASYMMETRY IN W - Z/+JETS EVENTS 83
7.7.2 OS-SS ASYMMETRY IN Z -** U+]ET EVENTS 86
7.7.3 OS-SS (A)SYMMETRY IN QCD MULTI-JET EVENTS 87
7.8 SYSTEMATIC UNCERTAINTIES 90
7.9 THE 7*/Z EXCHANGE IN THE REGION M INV 60 GEV 95
7.10 FINAL RESULTS FOR THE FULL (INCLUSIVE OS-SS) SELECTION 95
7.11 ALTERNATIVE BACKGROUND SUPPRESSION USING FAKE RATES 99
7.11.1 THE MATHEMATICAL SOLUTION OF THE EQUATION SYSTEM . . . 100
7.11.2 WORKING EXAMPLE ON MONTE CARLO LEVEL 101
7.11.3 FURTHER STUDIES USING FAKE RATES 101
7.12 SUMMARY OF THE VISIBLE MASS SELECTION 104
II
IMAGE 3
CONTENTS
8 DETERMINATION OF THE OVERALL HADRONIC TAU EFFICIENCY AND Z - * TT
CROSS SEC- TION MEASUREMENTS 105
8.1 GENERAL DESCRIPTION OF THE OVERALL TAU RECONSTRUCTION AND
IDENTIFICATION EFFICIENCY 105 8.2 A GENERAL DESCRIPTION OF THE LINEAR
APPROXIMATION FOR THE T-LEPTON IDENTIFICA- TION EFFICIENCY DETERMINATION
106
8.2.1 SEPARATION OF EVENTS INTO THREE SUB REGIONS 107
8.2.2 CONDITIONS FOR BACKGROUND SUPPRESSION 110
8.2.3 OS-SS RESCALING 114
8.2.4 SYSTEMATIC UNCERTAINTIES AFFECTING THE LINEAR APPROXIMATION 115
8.2.5 TAU-ID EFFICIENCY WITH LINEAR APPROXIMATION TECHNIQUE FOR FIRST
ATLAS DATA (INTEGRATED LUMINOSITY OF C = 35 PB~ L ) 115
8.3 TAU IDENTIFICATION EFFICIENCY FOR THE ELECTRON CHANNEL 119
8.4 TAU IDENTIFICATION EFFICIENCY FOR THE MUON CHANNEL 123
8.4.1 VISIBLE MASS SHAPE CORRECTION FOR THE ELECTRON CHANNEL 126
8.5 CROSS SECTION MEASUREMENTS FOR Z - TT,TG 126
8.5.1 CROSS SECTION DETERMINATION USING THE LINEAR APPROXIMATION 127
8.5.2 SYSTEMATIC UNCERTAINTIES FOR THE CROSS SECTION MEASUREMENTS WITH
THE LINEAR APPROXIMATION TECHNIQUE 131
8.6 SUBSTITUTION OF Z -» /Z/Z EVENTS INTO Z - R^TG EVENTS 132
8.6.1 INTRODUCTION OF THE EMBEDDING TECHNIQUE 134
8.6.2 SYSTEMATIC UNCERTAINTIES FOR THE EMBEDDING TECHNIQUE 136 8.6.3 TAU
IDENTIFICATION AND RECONSTRUCTION EFFICIENCY WITH THE EMBEDDING
TECHNIQUE ON MONTE CARLO LEVEL 137
8.6.4 TAU IDENTIFICATION AND RECONSTRUCTION EFFICIENCY WITH THE
EMBEDDING TECHNIQUE FOR FIRST ATLAS DATA (=35 PB 1 ) 139
8.7 ADDITIONAL CROSS CHECKS 142
8.7.1 LINEAR APPROXIMATION TECHNIQUE WITH N ^ ^ ^F TO N | ^
SUBSTITUTION 142 8.8 FURTHER STUDIES 147
8.8.1 THE TT -»* T H R E CHANNEL 147
8.8.2 THE W -»* T^V CHANNEL 148
8.9 SUMMARY OF THE EFFICIENCY DETERMINATION 149
9 SUMMARY AND OUTLOOK 151
9.1 SUMMARY 151
9.2 OUTLOOK 152
10 APPENDIX 153
III
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| any_adam_object | 1 |
| author | Fischer, Gordon |
| author_facet | Fischer, Gordon |
| author_role | aut |
| author_sort | Fischer, Gordon |
| author_variant | g f gf |
| building | Verbundindex |
| bvnumber | BV039798963 |
| ctrlnum | (OCoLC)918269903 (DE-599)DNB101710087X |
| dewey-full | 539.7211 |
| dewey-hundreds | 500 - Natural sciences and mathematics |
| dewey-ones | 539 - Modern physics |
| dewey-raw | 539.7211 |
| dewey-search | 539.7211 |
| dewey-sort | 3539.7211 |
| dewey-tens | 530 - Physics |
| discipline | Physik |
| format | Thesis Book |
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| spelling | Fischer, Gordon Verfasser aut Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS vorgelegt von Gordon Fischer Hamburg DESY 2011 IV, 178 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Hamburg, Univ., Diss., 2011 (DE-588)4113937-9 Hochschulschrift gnd-content DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024659474&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Fischer, Gordon Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |
| subject_GND | (DE-588)4113937-9 |
| title | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |
| title_auth | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |
| title_exact_search | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |
| title_full | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS vorgelegt von Gordon Fischer |
| title_fullStr | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS vorgelegt von Gordon Fischer |
| title_full_unstemmed | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS vorgelegt von Gordon Fischer |
| title_short | Determination of the tau-lepton reconstruction and identification efficiency using Z -> tau tau events in first data at ATLAS |
| title_sort | determination of the tau lepton reconstruction and identification efficiency using z tau tau events in first data at atlas |
| topic_facet | Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024659474&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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