Application Of Machine Learning Methods For The Analysis Of The Calibration Of The Lhcb Velo Detector Studies Of Irradiated Silicon Pixel Sensors And Reconstruction Of The Neutrino Interaction In Lartpc Detector
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Application Of Machine Learning Methods For The Analysis Of The Calibration Of The Lhcb Velo Detector Studies Of Irradiated Silicon Pixel Sensors And Reconstruction Of The Neutrino Interaction In Lartpc Detector
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Author : Maciej Witold Majewski
language : en
Publisher:
Release Date : 2022
Application Of Machine Learning Methods For The Analysis Of The Calibration Of The Lhcb Velo Detector Studies Of Irradiated Silicon Pixel Sensors And Reconstruction Of The Neutrino Interaction In Lartpc Detector written by Maciej Witold Majewski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Calibration Of The Lhcb Velo Detector And Study Of The Decay Mode D0 K Mu Nu Mu
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Author : Grant Duncan Mcgregor
language : en
Publisher:
Release Date : 2011
Calibration Of The Lhcb Velo Detector And Study Of The Decay Mode D0 K Mu Nu Mu written by Grant Duncan Mcgregor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The LHCb experiment, based at the Large Hadron Collider at CERN, is primarily designed to make precision measurements of the decays of heavy flavour hadrons, such as B and D mesons. This thesis is composed of two parts: the first consists of two studies of LHCb's vertex locator (VELO) and the second describes the development of methods for recording the decay D0->K-mu+nu_mu. The first VELO study involves calibration and monitoring of the gain (i.e. the detector response to input charge from particles). We propose a robust method to measure the gain response of each silicon sensor using calibration bits output by the sensors, and a method to recalibrate the gain simple enough to be followed by non-expert VELO users. This is followed by an investigation into into the prospects of using the VELO to perform particle identification using the characteristic energy deposition of each particle species (dE/dx). Finally, studies into the development of a trigger and a so-called 'stripping line' for recording D0->K-mu+nu_mu decays is presented. The relatively high cross-section for charm decays in LHCb mean this decay (with a branching fraction of 3%) occurs frequently, and the challenge of a trigger is to reduce this to a rate acceptable to write to disk. Finally, based on a sample of data from July and August 2011, the measured q 2 distribution for this decay is compared to the simple single-pole theoretical model, and the pole mass is measured to bem_pole=2.35 + 0.81 - 0.35 GeV/c 2.
Developing Silicon Pixel Detectors For Lhcb
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Author : Dónal Murray
language : en
Publisher:
Release Date : 2022
Developing Silicon Pixel Detectors For Lhcb written by Dónal Murray and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Pattern Recognition Tracking And Vertex Reconstruction In Particle Detectors
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Author : Rudolf Frühwirth
language : en
Publisher: Springer Nature
Release Date : 2021-02-26
Pattern Recognition Tracking And Vertex Reconstruction In Particle Detectors written by Rudolf Frühwirth and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-26 with Science categories.
This open access book is a comprehensive review of the methods and algorithms that are used in the reconstruction of events recorded by past, running and planned experiments at particle accelerators such as the LHC, SuperKEKB and FAIR. The main topics are pattern recognition for track and vertex finding, solving the equations of motion by analytical or numerical methods, treatment of material effects such as multiple Coulomb scattering and energy loss, and the estimation of track and vertex parameters by statistical algorithms. The material covers both established methods and recent developments in these fields and illustrates them by outlining exemplary solutions developed by selected experiments. The clear presentation enables readers to easily implement the material in a high-level programming language. It also highlights software solutions that are in the public domain whenever possible. It is a valuable resource for PhD students and researchers working on online or offline reconstruction for their experiments.
Radiation Damage Studies In The Lhcb Velo Detector And Measurement Of The Flavour Specific Asymmetry In Semileptonic B Decays
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Author : Adam Dane Webber
language : en
Publisher:
Release Date : 2013
Radiation Damage Studies In The Lhcb Velo Detector And Measurement Of The Flavour Specific Asymmetry In Semileptonic B Decays written by Adam Dane Webber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
This thesis presents several studies of data collected at the LHCb detector during its first two years of operation. A detector upgrade study is first presented, using simulated events at an increased luminosity. A second study involves radiation damage to the silicon sensors of the LHCb Vertex Locator. During 2010 and 2011the silicon sensors were exposed to a range of fluences, with sensors in the mostactive regions exposed to fluences of up to approximately 45x10 12 1MeV neutron equivalent (1MeV neq). The first observation of n+-on-n sensor type inversion at the Large Hadron Collider is reported, occurring at a fluence of around (10-15)x10 12 of 1MeV neq. The effective depletion voltages of the only n+-on-p sensors in use at the Large Hadron Collider have also been studied, with decreases of around 25V observed after initial irradiation. Following this, the effective depletion voltage inn+-on-p type sensors is observed to increase at a comparable rate to type inverted n+-on-n type sensors. A reduction in the charge collection efficiency due to an unexpected effect involving the sensor readout lines is also observed. A third study relates to CP violation in neutral B-meson mixing, by the measurement of the flavour-specific asymmetry. In the Standard Model, CP violation from this source is expected to be of order 10 -4. Any measured enhancement of this would be a strong indication of new physics. The DØ collaboration has measured the flavour specific asymmetry from B0 and B0s mixing, and found it to be inconsistent with the Standard Model at a confidence level of 3.9 standard deviations, thus motivating an independent measurement from the LHCb experiment. Using the full 2011 LHCb dataset, corresponding to 1.0 fb -1 of recorded luminosity, the B0s-meson component of the flavour-specific asymmetry is measured to be afs_s = (-0.12 +/- 0.48 +/- 0.34)%, where the first uncertainty is statistical and the second is systematic. This is the single most accurate measurement of afs_s, and is consistent with both the DØ measurement and the Standard Model prediction.
Commissioning Of The Lhcb Velo Detector And The Performance Of Irradiated Velo Sensors In A Proton Testbeam
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Author : Abdirizack Noor
language : en
Publisher:
Release Date : 2012
Commissioning Of The Lhcb Velo Detector And The Performance Of Irradiated Velo Sensors In A Proton Testbeam written by Abdirizack Noor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Development Of Machine Learning Trigger Algorithms And Search For Higgs Boson Pair Production
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Author : Jona Motta
language : en
Publisher: Springer
Release Date : 2025-07-27
Development Of Machine Learning Trigger Algorithms And Search For Higgs Boson Pair Production written by Jona Motta and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025-07-27 with Science categories.
This book reports the successful optimization of the Compact Mupn Solenoid (CMS) tau trigger algorithm for the Run-3 (Phase-1) of the Large Hadron Collider (LHC) and a completely new and original design of a machine learning based tau triggering algorithm for the High Luminosity LHC (or Phase-2). A large proportion of searches at collider experiments relies on datasets collected with a dedicated tau lepton selection algorithm, particularly difficult to operate in intense hadronic environments, making the work descirbed in this book of prime importance. The second part of the book describes a major and very challenging data analysis, aiming to detect Higgs boson pair production. The book summarizes these contributions in clear, pedagogical prose while keeping an adequate and coherent balance between the technical and data analysis aspects. Machine learning techniques were used extensively throughout this research; therefore, special care has been taken to describe their core principles and application in high-energy physics, as well as potential future developments for sophisticated low-latency trigger algorithms and modern signal extraction methods.
Design And Implementation Of The Monitoring And Analysis Software Platform For Upgraded Lhcb Velo Detector And Search For A New Fitting Method Based On Computational Intelligence Approach For B Dh Decays
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Author : Paweł Kopciewicz
language : en
Publisher:
Release Date : 2022
Design And Implementation Of The Monitoring And Analysis Software Platform For Upgraded Lhcb Velo Detector And Search For A New Fitting Method Based On Computational Intelligence Approach For B Dh Decays written by Paweł Kopciewicz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Machine Learning Based Long Lived Particle Reconstruction Algorithm For Run 2 And Upgrade Lhcb Trigger And A Flexible Software Platform For The Ut Detector Read Out Chip Emulation
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Author : Adam Dendek
language : en
Publisher:
Release Date : 2021
Machine Learning Based Long Lived Particle Reconstruction Algorithm For Run 2 And Upgrade Lhcb Trigger And A Flexible Software Platform For The Ut Detector Read Out Chip Emulation written by Adam Dendek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Luminosity Measurement At The Compact Muon Solenoid Experiment Of The Lhc
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Author : Olena Karacheban
language : en
Publisher: Springer
Release Date : 2018-06-22
Luminosity Measurement At The Compact Muon Solenoid Experiment Of The Lhc written by Olena Karacheban and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-22 with Science categories.
This book describes the application of a novel technology for beam instrumentation and luminosity measurement and first results on a cutting edge technology potentially to be used after the upgrade of the Large Hadron Collider to higher luminosity. It presents a unique diamond-based luminometer with a detailed performance study. The online bunch-by-bunch luminosity measurements provide an invaluable feedback to the Collider for beam optimisation and for the understanding of beam dynamics. The precision of the luminosity measurement is crucial for all physics analyses. This book highlights the Van der Meer method, which is used for the calibration of the luminometers of the CMS (Compact Muon Solenoid) experiment, and describes the estimate of systematic uncertainties, e.g. due to radiation damage of sensors and electronics and uncertainties of beam parameters. For the future high-luminosity upgrade of the collider, sapphire sensors are investigated in a test beam. It is demonstrated for the first time that sapphire sensors can be used as single particle detectors. A model for the charge transport in sapphire is developed and successfully applied.