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 13 of 13 for “"beyond the Standard Model (BSM)"”.
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Needles in the Quantum Haystack: CMS Anomaly Detection with Normalizing Flows
Recent experimental searches for particles beyond the Standard Model (BSM) have yielded little in the realm of new physics discoveries. A number of research efforts have adopted new anomaly detection strategies which utilize density estimation algorithms based on unsupervised and semi-supervised …
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Search for new phenomena using three-photon final states in data collected with the ATLAS detector at the Large Hadron Collider
<p>This thesis presents a search for new phenomena using three high-$p_T$ photons in the final state. In some Beyond the Standard Model (BSM) theories, a vector boson, $Z^\prime$, can decay to a pseudoscalar, $a$, and a photon, $\gamma$. The pseudoscalar can then decay into two photons: $Z^\prime …
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Precision Neutrino Oscillations: Important Considerations for Experiments
… what is important to consider when doing these precise experiments, especially in light of significant unresolved anomalies. We look at four general categories of considerations: systematic uncertainties, fundamental assumptions, parameterization-dependence of interpretations, and Beyond …
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First Step into A New Physics Realm: Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region
The search for neutrinoless double-beta decay (0𝜈𝛽𝛽) is the only way to prove the Majorana nature of neutrinos and is thus a major area of interest for neutrino physics. Discovering 0𝜈𝛽𝛽 and measuring its half-life will be the first solid evidence for physics beyond the Standard Model (BSM) and …
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Searching for signs of hidden sectors at the LHC: long-lived particle methods and models
Mysteries beyond the Standard Model (BSM) inspire theories, experiments and analysis tools that cover gaps in parameter space for new particles. Open questions ask the origins of neutrino masses, the mechanisms underlying flavour mass hierarchies, the matter-antimatter asymmetry and signs of dark …
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Particle Physics in the LHC Era
<p>During the past 100 years experimental particle physicists have collected an impressive amount of data. Theorists have also come to understand this data extremely well. It was in the first half of the 20th century the efforts of the early pioneers of quantum mechanics laid the ground work for …
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Parton Distributions in Beyond the Standard Model Theories
… of precise predictions for collider experiments. They are usually determined from fits to experimental data under the assumption that the Standard Model (SM) of particle physics is complete; however, this can bias studies of beyond the Standard Model (BSM) physics if these SM-like PDFs are used in …
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Searches for Higgs Boson Pair Production in the bbbb Final State with the ATLAS Detector
This thesis presents searches for Higgs boson pair production in the $b\bar{b}b\bar{b}$ final state using data collected by the ATLAS detector from proton-proton collisions at $\sqrt{s}=13$ TeV during the entirety of LHC Run 2 and at $\sqrt{s}=13.6$ TeV over a portion of Run 3. Three distinct …
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Unveiling fundamental physics with high-resolution X-ray spectroscopy of Active Galactic Nuclei.
This doctoral thesis explores the use of high-resolution spectroscopy of active galactic nuclei (AGNs) to probe fundamental physics. It focuses on the study of axion-like particles (ALPs) and the spin of supermassive black holes (SMBHs). Chapter 1 starts with a review of black holes as mathematical …
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The brown muck of b^0 and b^0_s mixing: beyond the standard model
Standard Model contributions to neutral B meson mixing begin at the one loop level where they are further suppressed by a combination of the GIM mechanism and Cabibbo suppression. This combination makes B meson mixing a promising probe of new physics, where as yet undiscovered particles and/or …
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Topological effects in particle physics phenomenology
This thesis is devoted to the study of topological effects in quantum field theories, with a particular focus on phenomenological applications. We begin by deriving a general classification of topological terms appearing in a non-linear sigma model based on maps from an arbitrary worldvolume …
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Clestial harmonics - Applications of Angular Power Spectra to Problems in Astroparticle and Cosmological Physics
The overarching topic of this thesis is the use of angular power spectra formalisms in the spherical harmonic space, aimed at inferring information on observables relevant to astroparticle physics and cosmology applications. Part I describes the work I developed at the University of Turin under the …
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Towards the formation of a forward-boosted beam of neutral antihydrogen for gravitational studies
The matter/antimatter asymmetry is one of the greatest mysteries in modern physics. In fact, the observable universe’s lack of antimatter poses a considerable problem for physicists, especially because the Standard Model predicts that the Big Bang should have produced identical amounts of matter …