Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor:
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| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
2003
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| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Item Description: | Zsfassung in dt. Sprache. - Text engl. - Karlsruhe, Univ., Diss., 2003 |
| Physical Description: | 191 S. Ill., graph. Darst. : 30 cm |
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MARC
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| 100 | 1 | |a Haag, Christian |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor |c von Christian Haag |
| 264 | 1 | |c 2003 | |
| 300 | |a 191 S. |b Ill., graph. Darst. : 30 cm | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Zsfassung in dt. Sprache. - Text engl. - Karlsruhe, Univ., Diss., 2003 | ||
| 502 | |a Karlsruhe, Univ., Diss., 2003 | ||
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| 650 | 0 | 7 | |a Bottom-Teilchen |0 (DE-588)4264356-9 |2 gnd |9 rswk-swf |
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Record in the Search Index
| _version_ | 1816445135272017920 |
|---|---|
| adam_text |
CONTENTS
ABSTRACT I
TABLE OF CONTENTS III
LIST OF FIGURES VII
LIST OF TABLES XI
INTRODUCTION 1
1 THE THEORETICAL BACKGROUND 5
1.1 GAUGE THEORIES. FI
1.2 THE STANDARD MODEL. 7
1.2.1 QUANTUM ELECTRO DYNAMICS (QED). 8
1.2.2 ELECTROWEAK INTERACTION . 9
1.2.3 QUANTUM CHROMO DYNAMICS (QCD) . 12
1.2.4 RUNNING COUPLING CONSTANTS . 14
1.3 THE PROCESS
E+E~ - HADRONS. 15
/
1.3.1 THE PROCESS E+RR -4
QQ . 15
1.3.2 THE PERTURBATIVE PHASE . 17
1.3.3 THE FRAGMENTATION PHASE. 18
1.3.4 PARTICLE DECAYS. 21
1.4 HEAVY HADRONS. 22
1.4.1 HEAVY QUARK EFFECTIVE
1 THEORY. 23
1.4.2 THE LIFETIMES OF 6-HADRONS. 24
III
BIBLIOGRAFISCHE INFORMATIONEN
HTTP://D-NB.INFO/967797004
IV
CONTENTS
2 THE EXPERIMENT 31
2.1 THE LEP COLLIDER. 31
2.2 THE
DELPHI DETECTOR. 33
2.2.1
DELPHI TRACK CHAMBERS. 34
2.2.2 CALORIMETRY. 37
2.2.3 PARTICLE IDENTIFICATION. 40
2.2.4 THE
DELPHI ANALYSIS CHAIN. 43
3 MATHEMATICAL TOOLS 47
3.1 NEURAL NETWORKS . 48
3.1.1 THE ORIGIN OF NEURAL NETWORKS . 48
3.1.2 THE BASIC CONCEPT. 49
3.1.3 ARCHITECTURE. 51
3.1.4 TRAINING A NEURAL NETWORK. 53
3.1.5 ADVANCED ALGORITHMS. 57
3.1.6 DATA PREPROCESSING. 61
3.1.7 ALTERNATIVE APPROACHES. 63
3.1.8 DEDICATED PROBLEMS . 67
3.1.9 APPLICATION IN HIGH ENERGY PHYSICS. 70
3.2 MONTE CARLO INTEGRATION. 70
3.2.1 QUASI RANDOM NUMBERS. 71
3.2.2 IMPORTANCE SAMPLING.
7P
3.3 PARAMETER ESTIMATION . 77
3.3.1 METHOD OF LEAST MEAN SQUARES. 78
3.3.2 THE MAXIMUM LIKELIHOOD METHOD . 79
4 INCLUSIVE RECONSTRUCTION AND IDENTIFICATION OF B-HADRONS 81
4.1 B-TAGGING. 83
4.1.1 THE CONFIDENCE METHOD. 84
4.1.2 THE COMBINATION METHOD. 85
4.2 BSAURUS . 86
4.2.1 MULT.IHADRONIC SELECTION . 87
CONTENTS
V
4.2.2 STANDARD PARTICLE SELECTION . 88
4.2.3 EVENT JETS. 88
4.2.4 EVENT HEMISPHERES. 89
4.2.5
B ENERGY RECONSTRUCTION . 89
4.2.6 INCLUSIVE SECONDARY VERTEX FINDING. 91
4.2.7 DECAY LENGTH AND DECAY TIME . 93
4.2.8 THE B-TRACK PROBABILITY NETWORK (TRACKNET) . 94
4.2.9 VERTEX RECONSTRUCTION. 96
4.2.10 THE 6-HADRON IDENTIFICATION NETWORK .100
4.2.11 FLAVOR TAGGING.104
4.2.12 BOTH HEMISPHERES B-SPECIES IDENTIFICATION NETWORK (BHBN)108
4.2.13 RECONSTRUCTING THE B-HADRON ENERGY BY A NEURAL NETWORK 109
5 STUDIES OF A B-HADRON LIFETIME MEASUREMENT USING A LIKELIHOOD
METHOD 113
5.1 THE MONTE CARLO SIMULATION.114
5.2 EVENT SELECTION.114
5.3 ACCEPTANCE FUNCTIONS.117
5.4 BACKGROUND FUNCTIONS.119
5.5 MODELING THE RESOLUTION.119
5.5.1 PROPER DECAY TIME RECONSTRUCTION.119
5.5.2 DECAY LENGTH RESOLUTION.120
5.5.3 MOMENTUM RESOLUTION.121
5.6 THE LIKELIHOOD FUNCTION.126
5.6.1 THE B-HADRON TAGGING.126
5.6.2 RESULTS FROM MONTE CARLO TESTS.'.132
5.7 SUMMARY AND DISCUSSION.134
6 MEASUREMENT OF THE LIFETIMES OF
B+
AND
B
MESONS 137
6.1 THE MONTE CARLO SIMULATION.138
6.2 EVENT SELECTION.139
6.3 PROPER DECAY TIME RECONSTRUCTION.140
6.4 MONTE CARLO WEIGHTING.141
VI
CONTENTS
C.5 SELECTION OF
B+
AND
B
ENHANCED SAMPLES.143
6.G THE
B+
AND
B
LIFETIME FIT.145
G.7 WORKING POINT AND RESULTS OF THE FIT.146
6.7.1 6-TAGGING CUT.147
6.7.2 NEURAL NETWORK MODIFICATION AND CUTS.147
6.7.3 ACCEPTANCE CORRECTION.150
6.7.4 FURTHER CROSSCHECKS .151
6.7.5 EXTRACTION OF THE RESULTS.153
6.8 SYSTEMATIC UNCERTAINTIES.157
6.8.1 PHYSICS MODELING.157
6.8.2 ANALYSIS METHOD.159
6.8.3 DETECTOR EFFECTS.162
6.9 SUMMARY .167
7 MEASUREMENT OF THE AVERAGE B-HADRON LIFETIME 169
7.1 SAMPLE SELECTION.169
7.2 THE AVERAGE 6 LIFETIME FIT.171
7.3 DISCUSSION OF SYSTEMATIC ERRORS.173
7.4 SUMMARY AND INTERPRETATION.175
8 CONCLUSION 177
BIBLIOGRAPHY 181
191
ACKNOWLEDGEMENTS |
| any_adam_object | 1 |
| author | Haag, Christian |
| author_facet | Haag, Christian |
| author_role | aut |
| author_sort | Haag, Christian |
| author_variant | c h ch |
| building | Verbundindex |
| bvnumber | BV017373820 |
| ctrlnum | (OCoLC)53024929 (DE-599)BVBBV017373820 |
| format | Thesis Book |
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| genre_facet | Hochschulschrift |
| id | DE-604.BV017373820 |
| illustrated | Illustrated |
| indexdate | 2024-11-22T17:37:52Z |
| institution | BVB |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-010470373 |
| oclc_num | 53024929 |
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| owner | DE-91 DE-BY-TUM DE-188 |
| owner_facet | DE-91 DE-BY-TUM DE-188 |
| physical | 191 S. Ill., graph. Darst. : 30 cm |
| publishDate | 2003 |
| publishDateSearch | 2003 |
| publishDateSort | 2003 |
| record_format | marc |
| spelling | Haag, Christian Verfasser aut Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor von Christian Haag 2003 191 S. Ill., graph. Darst. : 30 cm txt rdacontent n rdamedia nc rdacarrier Zsfassung in dt. Sprache. - Text engl. - Karlsruhe, Univ., Diss., 2003 Karlsruhe, Univ., Diss., 2003 DELPHI Teilchendetektor (DE-588)4348474-8 gnd rswk-swf Lebensdauer (DE-588)4034837-4 gnd rswk-swf Bottom-Teilchen (DE-588)4264356-9 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Bottom-Teilchen (DE-588)4264356-9 s Lebensdauer (DE-588)4034837-4 s DELPHI Teilchendetektor (DE-588)4348474-8 s DE-604 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010470373&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Haag, Christian Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor DELPHI Teilchendetektor (DE-588)4348474-8 gnd Lebensdauer (DE-588)4034837-4 gnd Bottom-Teilchen (DE-588)4264356-9 gnd |
| subject_GND | (DE-588)4348474-8 (DE-588)4034837-4 (DE-588)4264356-9 (DE-588)4113937-9 |
| title | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor |
| title_auth | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor |
| title_exact_search | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor |
| title_full | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor von Christian Haag |
| title_fullStr | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor von Christian Haag |
| title_full_unstemmed | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor von Christian Haag |
| title_short | Präzisionsmessungen der Lebensdauern von identifizierten b-Hadronen mit dem DELPHI-Detektor |
| title_sort | prazisionsmessungen der lebensdauern von identifizierten b hadronen mit dem delphi detektor |
| topic | DELPHI Teilchendetektor (DE-588)4348474-8 gnd Lebensdauer (DE-588)4034837-4 gnd Bottom-Teilchen (DE-588)4264356-9 gnd |
| topic_facet | DELPHI Teilchendetektor Lebensdauer Bottom-Teilchen Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010470373&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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