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 33 for “"LHCb experiment"”.
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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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Data preservation and reproducibility at the LHCb experiment at CERN
… CERN. In particular, provenance capture of the experimental data and 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 …
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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
… highly sensitive probe for new physics. Previous experimental searches have not observed this decay and have only set weak constraints on the upper limit of the branching ratio. This thesis presents the most precise search to date, using data collected by the LHCb detector from 2011-2018 , …
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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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A study of the CKM angle gamma using the LHCb experiment and a distributed workload management system
The LHCb experiment, at the Large Hadron Collider (LHC), will make precision CP violation measurements and search for new physics beyond the Standard Model of particle physics. The 14 TeV proton-proton collisions at the LHC will produce the full range of B-hadrons, at a data rate of peta-bytes per …
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MEASUREMENT OF THE CKM ANGLE Gamma WITH THE Lambda_b0--> D0pK. DECAY AND COMMISSIONING OF THE UPSTREAM TRACKER AT THE LHCB EXPERIMENT.
… Many theoretical predictions have been experimentally observed, starting with the 1964 discovery of CP violation in the neutral kaon system by James Cronin and Val Fitch. Since then, numerous flavour physics experiments have enriched our knowledge, observation after observation. Today, …
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The vacuum chamber in the interaction region of particle colliders : a historical study and developments implemented in the LHCb experiment at CERN
… esta en operación en 2007. Constará de 4 grandes experimentos uno de los cuales, LHCb, se dedicará a la investigación de la violación CP. Los requerimientos de la cámara de vacío de los experimentos en colisionadores de partículas son muy especiales. La presente tesis doctoral, en una primera …
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Tests of lepton universality in $B^{0} \to K_{S}^{0} l^{+} l^{-}$ and $B^{+} \to K^{*+} l^{+} l^{-}$ decays at the LHCb experiment
… under the SM, and can provide stringent experimental tests for novel physical processes which violate lepton universality. This dissertation presents new measurements of such ratios using $B^{0} \to K_{S}^{0} l^{+} l^{-}$ and $B^{+} \to K^{*+} l^{+} l^{-}$ decays, denoted …
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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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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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Quality assurance of the VELO modules and analysis of the Bd->K*\mu^+\mu^- rare decay on LHCb
The LHCb experiment is a high energy physics detector at the Large Hadron Collider. The experiment has been designed and built to search for new physics in the b hadron sector. This thesis discusses a contribution to the detector construction and preparatory studies for a rare decay analysis. …
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Measurement of the CP Violating Asymmetry a^s_sl using Bs0->(Ds->phi pi) mu nu
… acquired at the Large Hadron Collider with the LHCb experiment is presented. This measurement can help physicists understand some peculiarities in the Standard Model, which is the fundamental framework of knowledge of the universe. Should this asymmetry diverge from zero, new physics may be a …
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Measurement of CP Observables in B- -> D0 K- pi+ pi- Decays
… of the 3 fb^-1 data set collected by the LHCb experiment in 2011 and 2012 located at the LHC, CERN, Geneva, Switzerland is presented.</p> <p>The data set is comprised of one third taken at center of mass energy sqrt(s) = 7 TeV and the remaining two thirds taken at sqrt(s) = 8 TeV.</p> …
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Measurements of the absolute branching fraction of Λc+ → pK-π+ and the relative branching fraction of Bu+ → p π+ π+ Σc(2520)--.
… a hadronic environment, on data recorded by the LHCb experiment during the years 2011 and 2012, corresponding to an integrated luminosity of 3fb-1 . The branching fraction is measured to be B(Λc+ → pK-π+ ) = 0.079 ± 0.015(stat) ± 0.008(syst) In addition, the first observation of the decays Bu+ → …
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Development of a CO2 Cooling Test Facility from the Vertex Locator Thermal Control System
… detectors in the Large Hadron Collider beauty (LHCb) experiment at the European Organisation for Nuclear Physics (CERN). This type of cooling has become increasingly common in high-energy physics experiments, making their design and testing increasingly more important. The Detector Technologies …
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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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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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