EBOOK The Muon Trigger of the CMS experiment - design, performance, upgrade - Marcin Konecki

EBOOK The Muon Trigger of the CMS experiment - design, performance, upgrade
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Autor: Marcin Konecki

 Wydawnictwo: Uniwersytet Warszawski
ISBN: 9788323516705
EAN: 47300F5EEB
Format: 0,0 x 0,0 x 0,0
Oprawa: ...
Stron: 119
Data wydania: 2014
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The CMS experiment has operated smoothly during the LHC Run-1 (2010-2013). A large numer of collisions, triggered by the CMS Level-1 and High-Level trigger systems allowed CMS to discover the Higgs boson and perform many important physics measurements and searches.

In this monograph the muon trigger of the CMS detector is discussed, including its design
and performance. The CMS experiment is reviewed and its initial performance and operation are emphasized. The selected main physics results are shown. The detector upgrade perspectives are also presented.

The monograph is supplemented with the performance of the PACT trigger, development studies on muon isolation and simplified track reconstruction based on the Pixel Detector.
1. The CMS experiment at the LHC—design and initial performance    11

1.1. Introduction    11
1.2. CMS detector    12
1.3. CMS trigger and data acquisition system    13
1.4. CMS operation    15
1.5. Commissioning and initial detector performance results    17

2. The Level-1 muon trigger. Performance    22

2.1. Level-1 trigger    22
2.1.1. Calorimeter trigger algorithms    23
2.1.2. Muon trigger    25
2.1.3. Level-1 event selection    30
2.2. Muon trigger performance    32
2.2.1. Level-1 muon trigger efficiency    32
2.2.2. Level-1 muon trigger rates    33
2.2.3. Level-1 muon trigger timing    33

3. The muon track reconstruction at the High-Level trigger    36

3.1. Introduction    36
3.2. HLT operation    36
3.3. HLT reconstruction software    39
3.4. Basics of the muon reconstruction    41
3.5. Track and primary-vertex reconstruction    43
3.5.1. Seeding and pixel-based reconstruction    43
3.5.2. Combinatorial Track Finder    45
3.6. Muon reconstruction at the HLT    47
3.6.1. Level-2 reconstruction    48
3.6.2. Level-3 reconstruction    48
3.6.3. Muon isolation    49
3.6.4. Performance    50

4. Selected physics results    53

4.1. Introduction    53
4.2. Higgs physics    53
4.2.1. H › ??    54
4.2.2. H › ZZ › 4C    55
4.2.3. H › ??    56
4.2.4. Combination of Higgs measurement and Higgs properties determination    58
4.3. Vector boson production, top physics and QCD    58
4.4. Other selected measurements    60
4.4.1. Charged particle multiplicities and momentum spectra    60
4.4.2. Topological correlations in two-particle distributions    61
4.4.3. Search for rare B/Bs › µ+µ- decays    62
4.5. Searches for new phenomena beyond the Standard Model    63
4.6. Heavy-ion physics with CMS    64

5. Perspective outlook and summary    65

5,1, Introduction    65
5.2. CMS upgrades during Phase-I    65
5.2.1. RPC and CSC upscope in LS1    65
5.2.2. New Level-1 trigger    66
5.2.3. HCAL modifications    66
5.2.4. Pixel Detector replacements    66
5.3. Phase-II upgrades    67
5.4. Summary of physics results    67
5.5. Summary of muon trigger operation and author's contribution    68

A. The PACT for RPC system    69

A.1. Introduction    69
A.2. PACT system    70
A.2.1. Layout of the system    70
A.2.2. PAC algorithm    71
A.2.3. Segmentation and data flow    72
A.2.4. HSCP trigger    73
A.2.5. Commissioning challenges    75
A.3. PACT performance    75
A.4. Role of the RPC system in Level-1 muon trigger    77

B. Development of methods for track reconstruction, primary vertex finding and seed generation with the Pixel Detector    79

B.1. Introduction    79
B.2. Components of the reconstruction software    80
B.3. Estimate of track position uncertainties    81
B.3.1. Parametrization of hit errors    81
B.3.2. Parametrization of multiple scattering    81
B.3.3. Track bending in the longitudinal plane    82
B.4. Finding hit pairs    82
B.5. Finding hit triplets    85
B.6. Evaluation of the parameters of pixel-tracks    88
B.7. Pixel vertexing    89
B.8. Generation of seeds    90
B.8.1. Seeds from hit pairs    91
B.8.2. Seeds from hit triplets-91
B.9. Conclusions    91

C. Development of High-Level trigger algorithms for muon isolation    92

C.1. Introduction    92
C.2. Simulation    93
C.3. Isolation algorithm    94
C.3.1. Optimization of algorithms    95
C.3.2. Calorimeter isolation    96
C.3.3. Pixel isolation    97
C.3.4. Tracker isolation    100
C.4. Overall performance    105
C.4.1. Rate reduction    105
C.4.2. Signal efficiency    107
C.4.3. Algorithm timing    108
C.4.4. Discussion    108
C.5. Conclusions    109

D. Acronyms    110

Acknowledgements    111
Bibliography    112

Książka "EBOOK The Muon Trigger of the CMS experiment - design, performance, upgrade"
Marcin Konecki