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Refactoring of the data quality monitoring system in the Belle II vertex detector
Bártík, Jáchym ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
This bachelor thesis deals with refactoring of a part of the Data Quality Monitoring (DQM) code for the Belle II vertex detector. In the second part of the thesis, monitoring of vertex detector half-shells movement over time is implemented. After summarizing the basic information about the Belle II experiment, its vertex detector and the basf2 software system, we will describe the functional behaviour of the data quality monitoring modules. We analyze the code of the TrackDQM and AlignDQM modules and fix several errors. As a part of refactoring, we divide the calculations into several simpler parts and significantly reduce the code duplication. Finally, we add histograms of residuals from the half-shells, which we evaluate on real data, fit and display as a function of time. The contribution of this work is a code that is easier to maintain and extend, as well as free of some obvious bugs. Another result is a discovery of periodical movements of vertex detector half-shells, the understanding of which can lead to improvement of detector alignment. 1
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Measurement of Time-Dependent CP Violation in B0 → ŋcK0S at Belle Experiment, Optimization Studies of the Belle II Vertex Detector
Drásal, Zbyněk
Title: Measurement of Time-Dependent CP Violation in B0 → ηcK0 S at Belle Experi- ment, Optimization Studies of the Belle II Vertex Detector Author: Zbyněk Drásal Department: Institute of Particle and Nuclear Physics Supervisor: Dr. Zdeněk Doležal, IPNP Supervisor's e-mail address: Zdenek.Dolezal@mff.cuni.cz Abstract: This doctoral thesis deals with two independent topics. In the first part we present a measurement of branching ratio(s) and time-dependent CP violation parame- ters in B0 (B± ) → ηcK0 S(K± ), ηc → p¯p. The values of CP violation parameters have been found as follows: sin 2φ1, denoted as an SCP parameter, equals: SCP = 0.68+0.38 −0.46±0.13syst, the direct CP violation parameter, denoted as an ACP , is: ACP = 0.00+0.23 −0.31 ± 0.08syst. These results have been obtained with the final data sample of 772×106 B ¯B pairs collected at Υ(4S) resonance with a Belle detector at the KEKB e+ e− asymmetric collider machine in Japan. In the second part, we present our approach to the Monte Carlo (MC) simula- tion of Belle II vertex detector and its response to high energy particles. Belle II represents an upgrade of current Belle experiment and its designed vertex detector will consist of 2 layers of Depfet pixel detectors (PXD) and 4 layers of double-sided silicon micro-strip detectors (SVD). The MC...
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Refactoring of the data quality monitoring system in the Belle II vertex detector
Bártík, Jáchym ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
This bachelor thesis deals with refactoring of a part of the Data Quality Monitoring (DQM) code for the Belle II vertex detector. In the second part of the thesis, monitoring of vertex detector half-shells movement over time is implemented. After summarizing the basic information about the Belle II experiment, its vertex detector and the basf2 software system, we will describe the functional behaviour of the data quality monitoring modules. We analyze the code of the TrackDQM and AlignDQM modules and fix several errors. As a part of refactoring, we divide the calculations into several simpler parts and significantly reduce the code duplication. Finally, we add histograms of residuals from the half-shells, which we evaluate on real data, fit and display as a function of time. The contribution of this work is a code that is easier to maintain and extend, as well as free of some obvious bugs. Another result is a discovery of periodical movements of vertex detector half-shells, the understanding of which can lead to improvement of detector alignment. 1
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Simulation of noise in the Belle II strip vertex detector
Gruberová, Zuzana ; Kvasnička, Peter (advisor) ; Červenkov, Daniel (referee)
Title: Simulation of noise in the Belle II strip vertex detector Author: Zuzana Gruberová Institute: Institute of Particle and Nuclear Physics Supervisor: RNDr. Peter Kvasnička, Institute of Particle and Nuclear Physics Abstract: This bachelor thesis describes the development of strip noise simulation for the Belle II strip vertex detector (SVD). The overview part of the thesis describes the Belle II experiment and its detector system. The next part summarizes the basic princi- ples of semiconductor detectors with a focus on electronic noise. This section is followed by a more detailed description of Belle II SVD, its noise characteristics and simulation methods. The methods part introduces basic concepts of noise simulation using ma- chine learning methods, in particular, artificial neural networks. The experimental part describes the development and implementation of a production noise generator, and dis- cusses the performance, precision, and alternative solutions. Keywords: particle physics, Belle II, strip detector, noise, simulation, neural network 1
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Simulation of Belle II physics events and performance tests of reconstruction software
Kandra, Jakub ; Kvasnička, Peter (advisor) ; Řezníček, Pavel (referee)
This thesis is about the alignment of vertex semiconductor detectors of the Belle II experiment. It is divided into several sections. The first part introduces the Belle II experiment as a new generation B- factory, with its ambitious plans of data taking and physical analysis. The second part follows with a more detailed description of Belle II detector and software tools designed for their alignment and calibration. The central part of the thesis describes physical processes used for calibration of the vertex detector, connected with the search of an optimal solution for run-time monitoring and calibration of the detector. We also tested the effect of misalignment on the Belle II tracking software. The following part gives results of the study of misalignment effects on physical observables related to analysis of selected physical channels. The last part describes the development of a data quality monitoring tool for the tracking system. The tools has to provide a run-time diagnostic of misalignment and miscalibration by monitoring the precision and accuracy of reconstruction of physical observables. Powered by TCPDF (www.tcpdf.org)
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Simulation and analysis of tests of Belle II vertex detector sensors
Bilka, Tadeáš ; Kvasnička, Peter (advisor) ; Drásal, Zbyněk (referee)
This master thesis describes development and analysis of simulation, reconstruction and alignment for tests of Belle II vertex detector sensors as well as alignment procedure for the vertex detector itself. The first goal is to develop and test software tools which would allow analysis of sensor tests within common Belle II software framework. The second goal is to prepare the alignment chain for the vertex detector, being essential component of the detector calibration. First part of the thesis describes the Belle II experiment and its vertex detector, as well as the experimental beam test of the sensors and the common software framework. The theory behind the used alignment procedure utilizing Millepede II for alignment and General Broken Lines for track fitting is explained. Second part of the thesis then summarizes software tools developed or used and the results reached with these tools with emphasis on the alignment.
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Measurement of Time-Dependent CP Violation in B0 → ŋcK0S at Belle Experiment, Optimization Studies of the Belle II Vertex Detector
Drásal, Zbyněk
Title: Measurement of Time-Dependent CP Violation in B0 → ηcK0 S at Belle Experi- ment, Optimization Studies of the Belle II Vertex Detector Author: Zbyněk Drásal Department: Institute of Particle and Nuclear Physics Supervisor: Dr. Zdeněk Doležal, IPNP Supervisor's e-mail address: Zdenek.Dolezal@mff.cuni.cz Abstract: This doctoral thesis deals with two independent topics. In the first part we present a measurement of branching ratio(s) and time-dependent CP violation parame- ters in B0 (B± ) → ηcK0 S(K± ), ηc → p¯p. The values of CP violation parameters have been found as follows: sin 2φ1, denoted as an SCP parameter, equals: SCP = 0.68+0.38 −0.46±0.13syst, the direct CP violation parameter, denoted as an ACP , is: ACP = 0.00+0.23 −0.31 ± 0.08syst. These results have been obtained with the final data sample of 772×106 B ¯B pairs collected at Υ(4S) resonance with a Belle detector at the KEKB e+ e− asymmetric collider machine in Japan. In the second part, we present our approach to the Monte Carlo (MC) simula- tion of Belle II vertex detector and its response to high energy particles. Belle II represents an upgrade of current Belle experiment and its designed vertex detector will consist of 2 layers of Depfet pixel detectors (PXD) and 4 layers of double-sided silicon micro-strip detectors (SVD). The MC...
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Measurement of Time-Dependent CP Violation in B0 → ŋcK0S at Belle Experiment, Optimization Studies of the Belle II Vertex Detector
Drásal, Zbyněk ; Doležal, Zdeněk (advisor) ; Vrba, Václav (referee) ; Schwanda, Christoph (referee)
Title: Measurement of Time-Dependent CP Violation in B0 → ηcK0 S at Belle Experi- ment, Optimization Studies of the Belle II Vertex Detector Author: Zbyněk Drásal Department: Institute of Particle and Nuclear Physics Supervisor: Dr. Zdeněk Doležal, IPNP Supervisor's e-mail address: Zdenek.Dolezal@mff.cuni.cz Abstract: This doctoral thesis deals with two independent topics. In the first part we present a measurement of branching ratio(s) and time-dependent CP violation parame- ters in B0 (B± ) → ηcK0 S(K± ), ηc → p¯p. The values of CP violation parameters have been found as follows: sin 2φ1, denoted as an SCP parameter, equals: SCP = 0.68+0.38 −0.46±0.13syst, the direct CP violation parameter, denoted as an ACP , is: ACP = 0.00+0.23 −0.31 ± 0.08syst. These results have been obtained with the final data sample of 772×106 B ¯B pairs collected at Υ(4S) resonance with a Belle detector at the KEKB e+ e− asymmetric collider machine in Japan. In the second part, we present our approach to the Monte Carlo (MC) simula- tion of Belle II vertex detector and its response to high energy particles. Belle II represents an upgrade of current Belle experiment and its designed vertex detector will consist of 2 layers of Depfet pixel detectors (PXD) and 4 layers of double-sided silicon micro-strip detectors (SVD). The MC...
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Návrh křemíkového detektoru pro experiment Belle II
Kovaľ, Jozef ; Kodyš, Peter (advisor) ; Kvasnička, Peter (referee)
This bachelor thesis deals with the verifying of energy losses and checking the implementation of material into software on the inner tracking detector in the Belle II experiment in Japan. The Basf2 framework, which is developed especially for this experiment, was used for this confirmation. First part of the thesis theoretically describes the Belle II experiment, it's inner pixel silicon detector DEPFET and also describes software and analytics framework - Basf2, which is developed for Belle II. Second part presents the knowledge about the energy losses of the particle passing through matter. The last part compares theoretical values with the values acquired from the basf2 simulation.
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Vývoj křemíkového detektoru pro experiment Belle II
Bilka, Tadeáš ; Kodyš, Peter (advisor) ; Černý, Karel (referee)
This bachelor thesis describes a simulation of the DEPFET pixel semiconductor detector. The DEPFET detector is a key part of a newly constructed Belle II particle detector being built in KEK, Japan. The simulation is made as a package for the basf2 framework, developed for the Belle II experiment. The goal of this thesis was to learn about the Belle II experiment, DEPFET pixel detector and the basf2 framework and to develop a simulation environment, depicting experimental setup at CERN's SPS accelerator in 2009. First part of this thesis describes the Belle II detector, the basf2 framework and summarizes basic information about silicon particle detectors, especially about the DEPFET technology. A task for the analysis of the data is to evaluate residuals after particle track fitting and cluster information in the pixel detector. Finally the simulation with thinned DEPFET sensor being developed for the Belle II is done.
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