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 24 for “"B physics"”.
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Measurement of the ratio of branching fractions Br(B⁰s̳ [right arrow] D⁻s̳[pi]⁺)/Br(B⁰ [right arrow] D⁻[pi]⁺) at CEF-11
… is one of the flagship analyses for the Run II B physics program. The sensitivity of the measurement to the frequency of B⁰s oscillations strongly depends on the number of reconstructed B⁰ mesons. We present the measurement of the ratio of branching fractions Br ... , which directly influences the …
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The laser mirror alignment system for the LHCb RICH detectors
… 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 the LHCb experiment relies upon excellent particle …
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Search the decay of the B meson to two leptons at the Belle Experiment
The set of decays known as B⁰ → l⁺l⁻ are exceedingly rare. This thesis details procedures developed to optimize signal extraction and improve the upper limit on the measured branching fraction. When applied to 85 million BB events collected at the Belle experiment in Tsukuba, Japan, the resulting …
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Beauty meson to double open charm decays with the LHCb detector
… first time. These results will help to constrain physics beyond the Standard Model. Finally, a generic beauty hadron neural network and exclusive selections for doubly charmed beauty meson decays are developed, which are implemented in the trigger for future data taking. The improvement in …
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Determination of the CKM ratio $|V_{ub}|/|V_{cb}|$ using semileptonic $B_c^{+}$ decays at LHCb
… shower reconstruction at high energy particle physics experiments. A bespoke network, exploiting recent developments in image recognition and geometric deep learning, is designed to achieve one-shot 2D cluster reconstruction capable of learning an arbitrary detector-plane geometry. The …
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Doubly charmed B decays with the LHCb experiment
$CP$ violation is a necessary ingredient to create a matter-antimatter asymmetry. However, the amount of $CP$ violation incorporated in the Standard Model is orders of magnitude too small to explain the observed asymmetry. This thesis documents two studies of $CP$ violation with doubly charmed $B$ …
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Detector and Physics Performance of the ATLAS Inner Tracker
The thesis presents two interconnected research directions within the ATLAS exper- iment at the Large Hadron Collider. The first part concentrates on the performance evaluation of the ATLAS ITk Strip subdetector modules developed for the HL-LHC up- grade. Detailed studies of module behavior, …
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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 Standard Model (SM) of particle physics. These tensions form a coherent pattern, which could be caused by a novel physical effect. Ratios of branching fractions for muon-mode and electron-mode $b \to s l^{+} l^{-}$ processes can be predicted with O(1%) precision under the SM, and …
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Studies of rare B-meson decays to muons at the LHCb experiment
… predictions of the Standard Model of particle physics, search for indirect evidence for new physics beyond the Standard Model and search for new sources of CP violation. The studies documented in this dissertation are performed using proton-proton collision data, corresponding to integrated …
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Weak decays of beautiful pseudoscalar mesons with Lattice Quantum Chromodynamics
… probe the validity of our best model of particle physics: the Standard Model. In this thesis, I use specialised techniques to overcome practical challenges associated with the large mass of valence $b$ quarks to study a selection of decays of $B$ mesons with Lattice Quantum Chromodynamics. After …
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On the theory of irreversible processes
… Institute of Technology, Dept. of Physics, 1947.
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The mean specific gravity of the earth
… Institute of Technology, Department of Physics, 1876
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Fermion number fractionization in relativistic field theories : supersymmetry at finite temperature
… Institute of Technology, Department of Physics, 1984
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Neutron-deuteron elastic scattering and three-nucleon force
The differential cross section for neutron-deuteron elastic scattering was measured at six angles over the center-of-mass angular range 65⁰ - 1300⁰ and incident neutron energies 140 - 240 MeV at the LANSCE/WNR facility of the Los Alamos National Laboratory. Witala et al. (H. Witala et al. ), Phys. …
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A Measurement of the Reactions (Bar)p/p Going to Eta/eta, (Bar)p/p Going to Pi(0)/eta and (Bar)p/p Going to Pi(0)/pi(0) From 1.188 GeV/c to 1.445 GeV/c
The reactions p&d1;p→hh→4g ,p&d1;p→p 0h→4g and p&d1;p→p0p 0→4g were investigated at incident antiproton momenta between 1.188 and 1.445 GeV/c using the Low Energy Antiproton Ring (LEAR) at CERN. This investigation was part of an overall program searching for exotic …
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X-ray periodicities in sources observed by the RXTE ASM
The X-ray intensities measured from 230 X-ray sources observed by the RXTE All-Sky Monitor (ASM) were analyzed for periodic behavior. The ASM has been observing sources for nine years in the 1.5-12 keV energy range. In this search, we investigated a frequency range of 5 d⁻¹ to 144 d⁻¹ for periodic …
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African Easterly Waves: Evolution and Relationship to Atlantic Tropical Cyclones
Every year, a majority of all Atlantic hurricanes originate from African easterly waves. Yet, less than 20% of all African waves originate tropical cyclones (including hurricanes). It is of interest to investigate if African waves involved in cyclogenesis possess special characteristics, or if the …
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Novel resonance-assisted electromagnetic-transport phenomena
We first demonstrate theoretically and experimentally that electromagnetic resonators with high quality factors (Q) can be used to transfer power efficiently over distances substantially larger than the characteristic dimensions of the resonators by operating in a so-called "strongly coupled" …
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An analysis of reconnection dynamics in an eruptive flare model
<p>This dissertation develops a one-dimensional, analytic model for current sheets that form during solar flares. The model uses a method developed by B. V. Somov & V. S. Titov for Petschek-type reconnection. The first part of this dissertation provides a detailed analysis of the Somov-Titov model, …
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The Mechanics of Regaining Balance in Pirouettes
<p>All forms of dance incorporate examples of the human body in motion or standing in an aesthetically appealing pose. While balancing in a static position, dancers make small adjustments to avoid toppling. Balancing when the body is rotating around a vertical axis with one supporting foot at the …
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