Searches for CP violation in charmed meson decays: a study of D+ -> K - K+ pi+ at the LHCb experiment
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| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
Cham [u.a.]
Springer
2014
|
| Series: | Springer theses
|
| Subjects: | |
| Online Access: | Inhaltsverzeichnis Klappentext |
| Physical Description: | XV, 158 S. Ill., graph. Darst. |
| ISBN: | 9783319070667 |
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MARC
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| 100 | 1 | |a Gordon, Hamish |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Searches for CP violation in charmed meson decays |b a study of D+ -> K - K+ pi+ at the LHCb experiment |c Hamish Gordon |
| 264 | 1 | |a Cham [u.a.] |b Springer |c 2014 | |
| 300 | |a XV, 158 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
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| 502 | |a Zugl.: Oxford, Univ., Diss. | ||
| 650 | 4 | |a Quantentheorie | |
| 650 | 4 | |a Quantum theory | |
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| 655 | 7 | |0 (DE-588)4113937-9 |a Hochschulschrift |2 gnd-content | |
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Record in the Search Index
| _version_ | 1804152536546934784 |
|---|---|
| adam_text | Contents
Introduction and Theoretical Background
................... 1
1.1
Introduction
..................................... 1
1.2
The Standard Model
............................... 2
1.3
Quantum Chromodynarmcs
.......................... 3
1.4
The GWS Theory of Electroweak Interactions
............. 5
1.5
Introduction to CP Violation
......................... 8
1.6
Neutral Meson Mixing
............................. 9
1.7
CP Violation in the K{)
-»
π~π+
Decay
................. 11
1.8
Charm and CP Violation
............................ 13
1.9
Feynman Diagrams and Predicted CP Violation
in Charged
D
Decays
.............................. 14
1.10
The Need for New Physics and Its Possible Effects
in the Flavour Sector
.............................. 16
1.11
The Dalitz Plot
.................................. 17
References
.......................................... 20
The LHCb Detector
................................... 23
2.1
Introduction
..................................... 23
2.2
The LHC Machine
................................ 25
2.3
The
VELO
..................................... 26
2.4
The Tracking System and Magnet
..................... 29
2.5
The RICHes
.................................... 30
2.6
The Calorimeters
..................-.............. 33
2.7
The Muon System
................................ 34
2.8
Material Budget
.................................. 36
2.9
The DAQ and Electronics
........................... 36
2.10
The Hardware Trigger
............................. 37
2.11
The Software Trigger
.............................. 39
2.12
Event and Detector Simulation
....................... 40
2.13
Reconstruction and Analysis Software
.................. 41
References
.......................................... 42
Xl
xii Contents
3
Search for CP Violation in D+
—*
K~K+n+ Decays
with Data Collected at LHCb in
2010...................... 45
3.1
Introduction
..................................... 45
3.2
Dataset
and Selection
.............................. 47
3.3
Mass Spectra and Backgrounds
....................... 53
3.4
Sensitivity Studies and Binning Choice
.................. 55
3.5
Studies of the Control Decay Channels
and Related Cross-Checks
........................... 64
3.6
Results and Conclusion
............................. 71
References
.......................................... 74
4
Search for CP Violation in D+
—>
фп+
Decays
with Data Collected at LHCb in
2011...................... 75
4.1
Introduction
..................................... 75
4.2
Dataset
........................................ 78
4.3
Triggers
....................................... 79
4.4
Signal Selection Criteria
............................ 82
4.5
Yield Determination and Background Modelling
........... 88
4.6
Motivation for the Acp s Variable
..................... 95
4.7
Techniques to Reduce Susceptibility to Systematic Biases
.... 97
4.8
CP Asymmetries in Neutral Kaon Decays
................ 101
4.9
CP Asymmetry Results
............................. 103
4.10
Systematic Uncertainties and Cross Checks
............... 106
4.10.1
Introduction to Detector Asymmetries
............ 106
4.10.2
Investigation of Kinematic Effects
.............. 108
4.10.3
Investigation of the Effect of the Trigger
......... 110
4.10.4
Generic Systematic Uncertainty on Acp s
......... 112
4.10.5
Systematic Biases on Yield Determination
and Background Contamination
................ 113
4.10.6
Systematic Biases Due to Resolution Effects
....... 119
4.10.7
Systematic Biases Due to Charged Kaon
Interaction Asymmetries
..................... 121
4.10.8
Systematic Uncertainties Due to the Neutral Kaon
. . . 125
4.10.9
Cross-Check:
Effect of
Pion
Tracking Efficiencies
. . . 127
4.10.10
Cross Check: Dependence of Asymmetries
on Running Period
......................... 129
4.10.11
Checks for Effects on Aqp Due to Differences
in Selection Criteria Between D+
—>
φπ+
and D+
-*
Κ^.π+
Decays
..................... 131
4.10.12
Checks for Effects on ACp s Due to Kinematic
Differences Between Df and D+ Decays
......... 133
4Л0.13
Cross-Check: Difference in Raw Asymmetries
Between
£>+ —>
φη+
and Df
—»
η~π+π+
Decays.
... 134
4.10.14
Summary Tables of Systematic Uncertainties
...... 136
Contents
x.m
4.11
Discussion and Conclusions
......................... 137
References
.......................................... 138
5
Conclusions and Outlook
............................... 141
References
.......................................... 143
Appendix A: Parameters for the Mass Fit in Chapter
3.......... 145
Appendix B: Transformation from Linear to Square
Dalitz Plot Coordinates
........................ 147
Appendix C: Fit Parameters for Mass Fit in Chapter
4.......... 149
Appendix D: Additional Mass Fits for Chapter
4............... 153
Our current understanding of the fundamental building blocks of the
Universe, summarised by the Standard Model of particle physics, is incom¬
plete. For example, it fails to explain why we do not see equal> or almost
equal, numbers of particles and their antiparticle partners. To explain
this asymmetry requires» among other effects, a mechanism known as
charge-parity (CP) violation that causes differences between the rates at
which particles and
anüparticles
decay CP violation is seen in systems
containing bottom and strange quarks» but not in those with up> charm or
top quarks. This thesis describes searches for particle-antipartide asym¬
metries in the decay rates of charmed mesons. No evidence of CP viola¬
tion is found. With current sensitivities, an asymmetry large enough to
observe probably could not be explained by the Standard Model. Instead
an explanation could come from new physics, for example contributions
from supersymmetric or other undiscovered heavy particles. In the the¬
sis, the development of new techniques to search for these asymmetries is
described. They are applied to data from the LHCb experiment at
CERN
to make precise measurements of asymmetries in the I>*
—>
К Кг
ir
de¬
cay channel. This is the most promising charged
D
decay for CP violation
searches.
|
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| id | DE-604.BV042083767 |
| illustrated | Illustrated |
| indexdate | 2024-07-10T01:12:16Z |
| institution | BVB |
| isbn | 9783319070667 |
| language | English |
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| physical | XV, 158 S. Ill., graph. Darst. |
| publishDate | 2014 |
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| spelling | Gordon, Hamish Verfasser aut Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment Hamish Gordon Cham [u.a.] Springer 2014 XV, 158 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Springer theses Zugl.: Oxford, Univ., Diss. Quantentheorie Quantum theory Physics (DE-588)4113937-9 Hochschulschrift gnd-content Erscheint auch als Online-Ausgabe 978-3-319-07067-4 Digitalisierung UB Regensburg - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027524789&sequence=000003&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis Digitalisierung UB Regensburg - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027524789&sequence=000004&line_number=0002&func_code=DB_RECORDS&service_type=MEDIA Klappentext |
| spellingShingle | Gordon, Hamish Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment Quantentheorie Quantum theory Physics |
| subject_GND | (DE-588)4113937-9 |
| title | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment |
| title_auth | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment |
| title_exact_search | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment |
| title_full | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment Hamish Gordon |
| title_fullStr | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment Hamish Gordon |
| title_full_unstemmed | Searches for CP violation in charmed meson decays a study of D+ -> K - K+ pi+ at the LHCb experiment Hamish Gordon |
| title_short | Searches for CP violation in charmed meson decays |
| title_sort | searches for cp violation in charmed meson decays a study of d k k pi at the lhcb experiment |
| title_sub | a study of D+ -> K - K+ pi+ at the LHCb experiment |
| topic | Quantentheorie Quantum theory Physics |
| topic_facet | Quantentheorie Quantum theory Physics Hochschulschrift |
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