Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"LHCb"”.
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Development of radiation hard readout electronics for LHCb
Das Experiment LHCB am CERN ist zur Zeit in der Entwicklungsphase und hat zum Ziel, CP-Verletzung im System der B-Mesonen mit sehr hoher Präzision zu messen. In dem Experiment wird ein mit Silizium-Mikrostreifenzähler n ausgestatteter Vertex-Detektor eingesetzt. Ein Mikrochip, der für die Auslese …
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LHCb distributed data analysis on the computing grid
LHCb is one of the four Large Hadron Collider (LHC) experiments based at CERN, the European Organisation for Nuclear Research. The LHC experiments will start taking an unprecedented amount of data when they come online in 2007. Since no single institute has the compute resources to handle this …
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Doubly charmed B decays with the LHCb experiment
… were performed using Run I data collected by the LHCb experiment in $pp$ collisions at the LHC. This corresponds to 1.0 fb$^{-1}$ collected at a centre-of-mass energy of 7 TeV and 2.0 fb$^{-1}$ collected at a centre-of-mass energy of 8 TeV. The first analysis is a search for $B_c^+$ decays to two …
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Aufbau der Ausleseelektronik für das äußere Spurkammersystem des LHCb-Detektors
… des äußeren Spurkammersystems des LHCb-Detektors miát die Driftzeiten in den Straw-Proportionalzählern, digitalisiert das Zeitsignal und speichert es in einem 160 Worte tiefen Speicher. Bei positiver Vortriggerentscheidung wird die Driftzeitinformation serialisiert und über …
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The laser mirror alignment system for the LHCb RICH detectors
The Large Hadron Collider beauty (LHCb) experiment at the Large Hadron Collider (CERN), is the next generation B physics experiment designed to precisely constrain the Cabibbo-Kobayashi-Maskawa (CKM) matrix measurements with unprecedented accuracy, as well as search for new physics. The success of …
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Data preservation and reproducibility at the LHCb experiment at CERN
… the reproducibility of physics analyses at the LHCb experiment were studied. First, the preservation of the software and hardware dependencies of the LHCb experimental data and simulations was investigated. It was found that the links between the data processing information and the datasets …
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Beauty meson to double open charm decays with the LHCb detector
… collected in proton-proton collisions by the LHCb detector at the Large Hadron Collider (LHC) between 2011 and 2018. Firstly a search for sixteen rare decays of the $B_c^+$ meson to two charm mesons is performed. Studies of $B_c^+$ meson can improve understanding of heavy quark dynamics, and …
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Measurements of $B \to \mu^+ \mu^-$ decays using the LHCb experiment
… a study of very rare $B$-meson decays at the LHCb experiment, using data taken during the first experiment run of the Large Hadron Collider (LHC) and during the second experiment run until September 2016. The LHCb experiment was designed to test the Standard Model of particle physics and to …
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Studies of rare B-meson decays to muons at the LHCb experiment
… both dimuon and four-muon, are studied at the LHCb experiment using data recorded during the first and second data-taking periods of the Large Hadron Collider, spanning the years 2011–2012 and 2015–2018, respectively. LHCb is a specialised experiment dedicated to the study of b- and c-hadrons …
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Search for the B+ → π+e+e− decay with the LHCb experiment
… search to date, using data collected by the LHCb detector from 2011-2018 , corresponding to 9 fb−1 of pp collisions. The B+ → π+e+e− signal is observed with a significance of 3.2σ, constituting the first evidence for this decay. The branching ratio is measured to be B(B+ → π+e+e−) = ( 2.44 …
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Development and Characterisation of a Radiation Hard Readout Chip for the LHCb-Experiment
… tracker (ITR) and the RICH detectors of the LHCb experiment.
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The Search for Dark Photons at LHCb and Machine Learning in Particle Physics
… in proton-proton collisions and collected by the LHCb experiment at the Large Hadron Collider at CERN. In addition, this thesis proposes various machine and deep learning techniques and their applications to particle physics: classifier bias on a continuous feature can be controlled more flexibly …
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MEASUREMENT OF THE MAGNETIC AND ELECTRIC DIPOLE MOMENTS OF THE $\LAMBDA$ BARYON AT LHCB
… is conducted using data collected by the LHCb experiment during the \mbox{Run 1} and \mbox{Run 2} of the LHC, corresponding to an integrated luminosity of about 9 fb$^{-1}$. The LHCb detector was designed to investigate CP-violating phenomena of beauty and charm hadrons. This thesis …
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Development, Optimisation and Characterisation of a Radiation Hard Mixed-Signal Readout Chip for LHCb
… the radiation hard Beetle readout chip for the LHCb experiment have been developed. The overall chip performances like noise, power consumption, input charge rates have been optimised as well as the elimination of failures so that the Beetle fulfils the requirements of the experiment. …
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Entwicklung, Bau und Alterungsstudien von Straw Tube Driftkammern für das Äußere Spurkammersystem von LHCb
… dem Bau des Aeusseren Spurkammersystems fuer das LHCb-Experiment am CERN beteiligt. Das Aeussere Spurkammersystem wird modular aus 5 m langen Strawtube-Driftkammern zusammengesetzt. Diese Arbeit beschreibt die Entwicklung von einem Driftkammer-Prototypen Ende 2001 bis zum endgueltigen Kammerdesign …
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Development and Characterisation of a Radiation Hard Readout Chip for the LHCb Outer Tracker Detector
… tracks in the Outer Tracker detector of the LHCb experiment requires to measure the drift times of the straw tubes. A Time to Digital Converter (TDC) chip has been developed for this task. The chip integrates into the LHCb data acquisition schema and fulfils the requirements of the …
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Performance of hybrid photon detectors and studies of two-body hadronic B decays at LHCb
The LHCb experiment at the CERN LHC accelerator will begin physics data taking in late 2009. LHCb aims to discover New Physics processes via precision measurements using heavy flavoured hadrons, such as B and D hadrons. This thesis describes studies relevant to measurements of B decays to hadronic …
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Alignment of the LHCb Vertex Locator and lifetime measurements of two-body hadronic final states
… hadronic final states of heavy flavour decays at LHCb. The LHCb experiment is designed to measure heavy flavour particle decays produced in proton-proton collisions at the LHC. Key to high quality vertexing is the spatial alignment of the Vertex Locator. The algorithms designed for this task, …
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Determination of the CKM ratio $|V_{ub}|/|V_{cb}|$ using semileptonic $B_c^{+}$ decays at LHCb
… proton-proton collision data collected by the LHCb experiment operating at the Large Hadron Collider at CERN. The measurement makes use of a data sample collected between 2016 and 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5.1\,\textrm{fb}^{-1}$. …
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Innovative silicon pixel sensors for a 4D VErtex LOcator detector for the LHCb high luminosity upgrade
… could provide at interaction point 8, where the LHCb experiment is located, a second experiment upgrade, called upgrade II, is planned to take place during Long Shutdown 4 in 2033. In order for the experiment to improve or at least maintain the current physics performances also in the high …
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