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 94 for “"model-independent"”.
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Model-independent approaches to QCD and B decays
… for B-meson decay rates in the Standard Model. Strong-interaction effects described by quantum chromodynamics (QCD) make this a challenging endeavor. Exact solutions to QCD are not known, but an arsenal of approximation techniques have been developed. We apply effective field theory …
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Model independent search for new physics at the Tevatron
The Standard Model of elementary particles can not be the final theory. There are theoretical reasons to expect the appearance of new physics, possibly at the energy scale of few TeV. Several possible theories of new physics have been proposed, each with unknown probability to be confirmed. Instead …
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A quasi-model-independent search strategy for new high-pT physics at Tevatron Run II
… physics will take are all over the map. A quasi-model-independent search strategy for new physics (SLEUTH) was introduced in Tevatron Run I to allow a probe of high-pT hadron collider data. This dissertation prescribes the SLEUTH algorithm that will be used in Tevatron Run II. Improvements over …
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Improvements in Upper Limits of the Neutralino-Proton Cross Section through use of Model-Independent Nuclear Form Factors.
… computed with standard, one or two parameter model-dependent nuclear form factors, which may not exactly mirror the actual form factor for the particular nucleus in question. As is well known, elastic electron scattering can allow for very precise determinations of nuclear form factors and …
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Common and Model-Specific Factors: What Marital Therapy Model Developers, Their Former Students, and Their Clients Say About Change
… research consistently reveal that all tested models of marriage and family therapy (MFT) work, and they generally work equally well. Researchers have hypothesized that this may be due to factors common across models responsible for change. Despite a sizable body of common factors literature in …
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Constraining reionization: Evidence from 21 cm limits and predictions for fast radio bursts
… only been done for specific reionization models; I propose using a model-independent parameterization of reionization. I employ synthetic data of future FRB measurements at high redshifts z>5 to show that (i) the model-independent method removes a significant bias in the inferred optical …
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A Measurement of the Branching Fraction B(positive Strange D Meson Decays to Meson Positive Pion) at CLEO
I present a model-independent measurement of the ratio of branching fractions BD+s→ fp+ /BD0→K +p- by partially reconstructing the decay B0→D*+s D*- . Using 8.9fb-1 of on-resonance data collected with the CLEO II detector at CESR and the known value of BD0→K +p- , I determine …
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Direct Ion-Temperature Measurements Using High-Resolution Inelastic X-ray Scattering
… in inferred ion temperatures. Direct, model-independent temperature measurements are needed to resolve these discrepancies. This dissertation presents the development of a high-resolution inelastic-scattering platform capable of directly measuring ion temperature in HED matter. Designed …
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Weak Decay Studies From An Effective Theory Standpoint
… of some weak interaction decays using a model independent approach by employing effective field theories. I discuss the soft photon contribution and background effect to the rare dimuonic decay of the neutral B meson. I also study some radiative exclusive W boson decays in the standard …
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Observation of J/psi p resonances consistent with pentaquark states in Lambda_b^0 to J/psi K^- p decays
… with only $K^- p$ resonances in the amplitude model. For satisfactory fits of the data, it was found to be necessary to include two $J/\psi p$ resonances, with each having significances of over 9 standard deviations. One has a mass of $4449.8\pm1.7\pm2.2$ MeV and a width of $39\pm5\pm16$ MeV, …
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Separation of the E2 and M1 form factors of the 6.32 MeV state of nitrogen-15 using (electron,electron'gamma)
… data. This experiment is the first model independent separation of the multipoles that contribute to a mixed transition. Data were obtained with the MAMI A electron accelerator at momentum transfers q = 0.40, 0.63, 0.83, 1.1, and 1.2 fm$\sp{-1}$. Analysis of the data at q = 0.63 and …
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Depth and orbital tuning : a new chronology of glaciation and nonlinear orbital climate change
… to orbital variations. By developing a new age-model, independent of orbital assumptions, a significant non-linear response to orbital forcing becomes evident in the [delta] 18 0 record. The new age-model also indicates glacial terminations two through eight are 8,000 years older than the …
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Tools for electromagnetic field simulation in the KATRIN experiment
… beta decay experiment designed to make a direct, model independent measurement of the electron neutrino mass. To accomplish this task, the experiment employs precisely defined electric and magnetic fields for particle transport and mass spectroscopy. In order to simulate particle trajectories in …
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Towards Developing an Integrated Microscopic Traffic Simulation Model for Large Road Networks
… Transport Systems (ITS), traffic has to be modelled. The inherent complexity which is a result of inter- and intra-driver heterogeneity, macroscopic feedback loops, local interactions, multi-modal transport and many more is tackled with simulations. By representing the (longitudinal) …
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Theory of High Temperature Spin Dynamics
… results presented in this thesis include: (I) model-independent analysis of the long-time behavior of the correlation functions of interest, which reveals that that behavior has a universal functional form; (II) model for approximate calculations of the correlation functions of interest; (III) …
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The proton Compton effect: A measurement of the electric and magnetic polarizabilities of the proton
… scattering cross section is well constrained by model-independent theory and was measured to check the systematics of our experimental and data reduction procedures. Within the statistical errors, the measured forward cross section agrees with theory. The following values for the polarizabilities …
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A sequential adaptive sampling technique based on a local linear model for computer experiment applications
… of this dissertation research is to develop a model independent sequential adaptive sampling technique for surrogate model (SM) applications based on a local linear model. This technique, called Nearest Neighbors Adaptive Sampling (NNAS), is conceived to be conceptually simple, computationally …
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Computational Framework for Uncertainty Quantification, Sensitivity Analysis and Experimental Design of Network-based Computer Simulation Models
… real-world, networked system using a simulation model, features are usually omitted or represented by probability distributions. Verification and validation (V and V) of such models is an inherent and fundamental challenge. Central to V and V, but also to model analysis and prediction, are …
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Cosmological Models and Observation
… cosmological software package Cmbeasy we compute model predictions and compare these with experimental data. For constraining cosmological models quickly and conveniently we employ Markov Chain Monte Carlo simulation. We describe both the theory and the specific implementation in Cmbeasy. These …
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