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 26 for “"Neutrino masses"”.
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Neutrino masses and Baryogenesis via Leptogenesis in the Exceptional Supersymmetric Standard Model
Neutrino oscillation experiments discover that (left-handed) neutrinos have masses much less than charged leptons and quarks in the Standard Model. One solution to the light neutrino mass puzzle is the seesaw model where right-handed neutrinos are introduced with large Majorana masses. The heavy …
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Phenomenology of the minimal <i>B - L</i> extension of the Standard Model at the LHC
A well-motivated framework to naturally introduce neutrino masses is the <i>B - L</i> model, a <i>U</i>(1) extension of the standard model related to the baryon minus lepton gauged number. Besides three right-handed neutrinos, that are included to cancel the anomalies (thereby naturally providing …
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Μελέτη του μιονικού και λεπτονικού αριθμού στις σύγχρονες θεωρίες βαθμίδας
… THE INTRODUCTION EITHER OF THE RIGHT- HANDED NEUTRINO OR OF NEW EXOTIC SCALARS (HIGGS MULTIPLETS), B) SIMILAR EXTENSIONS OF THE GRAND UNIFIED THEORIES SU(5), SO(10) ARE ALSO DISCUSSED. IN PARTICULAR, THE NEUTRINO MASSES AND MIXING WHICH ARE INVOLVED ARE OBTAINED IN A SIMPLE MECHANISM BASE IN …
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Towards a reconstruction of the SUSY seesaw model
… of the observables on the unknown seesaw, light neutrino and mSUGRA parameters. In order to separate these different influences, we first considered two classes of seesaw models, namely quasi-degenerate and strongly hierarchical right-handed neutrinos. As a generalisation, we presented a method …
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Left-right symmetric model and its TeV-scale phenomenology
… also to solve the problem of understanding the neutrino masses via the seesaw mechanism. If the scale of parity restoration is in the few TeV range, we can expect new physics signals that are not present in the Standard Model in planned future experiments. We investigate the TeV-scale …
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Doppler shifts in the KATRIN experiment
In the past few decades, neutrinos, which are predicted to be massless particles by the Standard Model of Particle Physics, have been shown to have non-zero mass. The absolute scale of this neutrino mass has significant implications in particle physics, astrophysics, and cosmology. The KATRIN …
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Dark Matter Models in Non-Supersymmetric SO(10) Unification Models
… phenomenological constraints, such as the light neutrino masses, direct detection bounds on dark matter candidates and the proton decay lifetime. Finally, we demonstrate that the vacuum stability problem of the Standard Model can be evaded by one of our scalar dark matter models.
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Statistical Signal Processing and Detector Optimization in Project 8
Despite the unambiguous discovery of non-zero neutrino masses from flavor oscillation experiments, a direct measurement of the absolute mass scale of the neutrino remains elusive to experimentalists. Project 8 is a tritium endpoint experiment utilizing Cyclotron Radiation Emission Spectroscopy …
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Phenomenological Consequences of Heavy Right Handed Neutrinos
The discovery of neutrino mixing provides the possibility of a non vanishing CP violating phase in the neutrino mixing matrix. CP violation in the leptonic sector can be large enough to explain the matter-antimatter asymmetry in the universe. An indirect probe of CP violation is the experimental …
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Signals from portals to non-minimal hidden sectors
… of the problems of the SM, such as the origin of neutrino masses, the little hierarchy problem, and the nature of dark matter. In these scenarios, interactions of the HS with the SM are only possible through terms in the Lagrangian that couple gauge invariant operators of the SM (portals) to …
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Search for neutrinoless double beta decay of ¹¹⁶Cd and ⁸²Se and calorimeter simulations for the SuperNEMO experiment
… kg• y were used to measure the half-life of two-neutrino double beta decay (2[nu][beta][beta]) to the ground states of ¹¹⁶Sn and ⁸²Kr and to place a lower limit on the neutrinoless double becay decay (0[nu][beta][beta]) to the same ground states. Under the single-states dominance hypothesis, the …
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Phenomenology of new physics beyond the Standard Model: signals of Supersymmetry with displaced vertices and an extended Higgs sector at colliders
… These include the experimental observations of neutrino masses and dark matter, which confirms there must be new physics. What this new physics may look like at colliders motivates the original work in this thesis, which comprises three studies: the prospects of future electron-positron …
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Rare-event searches with bolometers
… such as Dark Matter (DM) or the nature of neutrino masses. Over the last 30 years, these experiments have grown larger and more sophisticated, allowing us to probe new and exciting theories of the universe. At the same time, we have started to apply the technologies and techniques used in …
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Searching for signs of hidden sectors at the LHC: long-lived particle methods and models
… new particles. Open questions ask the origins of neutrino masses, the mechanisms underlying flavour mass hierarchies, the matter-antimatter asymmetry and signs of dark matter. These questions are solved in theories of new long-lived particles (LLPs) in hidden sectors, but in practice the current …
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Measurement of K+ Production in νμ Charged-Current Interactions on Liquid Argon with MicroBooNE and Enhancing Proton Decay Sensitivity at DUNE
… several key observations including non-zero neutrino masses, matter–antimatter asymmetry, or dark matter. Studies of neutrino oscillations and proton decay offer pathways to searching for physics beyond the SM. The Deep Underground Neutrino Experiment (DUNE), utilising liquid argon time …
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Radiative symmetry breaking in the supersymmetric minimal B-L extended standard model
… interactions. However, there is evidence from neutrino physics and astrophysical cosmology which is at odds with the SM framework. It appears likely that the validity of the SM will be compromised at energy scales of a few TeV. A more fundamental theory will certainly be required, and such …
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Constraining gravitational and cosmological parameters with astrophysical data
… the sensitivity to spatial curvature and neutrino masses by up to two orders of magnitude, to k 0.0002 and m 0.007eV, and giving a 4s detection of the spectral index running predicted by the simplest inflation models.
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Cosmological signatures of fundamental physics
… theories. Determining the absolute mass scale of neutrinos is an interesting problem in particle physics, and can shed light on the mass generation mechanism for neutrinos, which, in turn, can tell us about physics beyond the Standard Model. To fully exploit the signatures of massive neutrinos on …
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GALAXY-HALO CONNECTION AND CLUSTERING IN THE PRESENCE OF DYNAMICAL DARK ENERGY AND MASSIVE NEUTRINOS
… used, the so-called “Dark Energy and Massive Neutrino Universe” (DEMNUni) project, spanning several cosmological models with different neutrino masses and/or different equations of state of dynamical dark energy. The author of this Thesis has applied to these simulations the subhalo abundance …
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