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 18 of 18 for “"Theoretical Uncertainties"”.
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Energy loss and theoretical uncertainties in small quark-gluon plasmas
… than in large systems, motivating the need for theoretical guidance on the problem. The goal of this thesis is to systematically improve current energy loss models, particularly in how they pertain to small systems. We present a perturbative Quantum Chromodynamics (pQCD) based energy loss model …
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HIGH ENERGY RESUMMATION IN PERTURBATIVE QCD
… resummation are compared to various sources of theoretical uncertainties like PDFs and scale variations. We show how the high--energy resummation procedure stabilizes the logarithmic enhancement of the cross section at high--energy which is present at any fixed order in the perturbative …
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Perturbative QCD in exclusive processes
… form factors, ψ → pp̅, and 𝛾𝛾 → pp̅, to the theoretical uncertainties of the nucleon wave function and the form of the running coupling constant is investigated. A new prediction for the cross-section for 𝛾𝛾 → Δ++ Δ̅++ with sum-rule wave functions is presented. As a product of the development …
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FAITHFUL ESTIMATION OF UNCERTAINTIES IN MODERN PDF EXTRACTIONS
… the precise determination and validation of the uncertainties associated with parton distribution func- tions (PDFs). We introduce and implement the theory covariance method within the NNPDF4.0 framework, enabling the incorporation of theoretical uncertainties into the PDF determination process. …
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Robust Estimation Techniques for the Cosmological Analysis of Large Scale Structure
… leverage those data sets, one needs exquisite theoretical predictions. Here, the main difficulty is the non-linear nature of the large-scale structure observables which, together with the exquisitely small statistical errors, cause real concern of false discoveries. In this thesis, we study two …
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Fluctuating Open Heavy Flavour Energy Loss in a Strongly Coupled Plasma with Observables from RHIC and the LHC
… for various centrality classes. There are some uncertainties in terms of how we phenomenologicaly apply energy loss calculations computed in AdS/CFT. One uncertainty is related to how the diffusion coefficient behaves as a function of momentum in AdS/CFT. We make predictions for the two known …
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Metrics, Muons, Moments, Models, Machine Learning, Measurements, and More: A Manifesto on Collider Physics
… that cannot fully be trusted, experimental and theoretical uncertainties, overwhelmingly large amounts of data, all while we have yet to find any deviations from the Standard Model. In this thesis, we propose strategies for improving the theory ↔ experiment pipeline at all stages. We first show …
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Rapidity evolution of observables at high energies using the Gaussian truncation
Today, the biggest predictive uncertainties in the Standard Model arise from theoretical uncertainties in quantum-chromo-dynamics contributions to cross-sections measured at high-energy collider experiments. At high energies, the quantum-chromo-dynamics of particle collisions is well described …
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Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu l nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub|
… from the measured $\Delta \tilde{\BR}$ using theoretical calculation based on Heavy Quark Expansion. The result is $|V_{ub}| = (4.19 \pm 0.18{}^{+0.26}_{-0.20} {}^{+0.26}_{-0.25}) \times 10^{-3}, where the errors represent experimental uncertainties, uncertainties from HQE parameters and …
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Primordial Nucleosynthesis in the New Age of Cosmology: Determining Uncertainties, Examining Concordance, and Probing New Physics
… is a quantitative understanding of the uncertainties in the BBN light element abundance predictions. These uncertainties are dominated by systematic errors in nuclear cross sections. We critically analyze the cross section data, producing representations that describe this data and its …
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Fragmentation and nucleon structure in semi-inclusive deep-inelastic scattering at the HERMES experiment
… between the experimental systematics, theoretical uncertainties, and the applicability of the factorization theorem within the standard framework of leading-twist collinear QCD. This is illustrated by the extraction of the valence quark ratio dv/uv at leading-order in αs. These results …
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Primordial Nucleosynthesis In The New Age Of Cosmology: Determining Uncertainties, Examining Concordance, And Probing New Physics
… is a quantitative understanding of the uncertainties in the BBN light element abundance predictions. These uncertainties are dominated by systematic errors in nuclear cross sections. We critically analyze the cross section data, producing representations that describe this data and its …
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Measurement of Electroweak W Boson Production via Vector‐Boson Fusion in Proton–Proton Collisions at √s = 13 TeV with the CMS Detector
… it. The first part of the work establishes the theoretical and statistical foundations of the measurement, introducing the mathematical structure of the SM and its Effective Field Theory (EFT) extension, together with the likelihood based methods used for parameter inference. A brief description …
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Extending the Reach of Searches for Staus, Charginos and Neutralinos with the ATLAS Experiment at the Large Hadron Collider
… level, under the assumption that signal theoretical uncertainties have a negligible impact. The vector boson fusion channel is assessed to have comparatively limited sensitivity with differences in the signal modelling between this study and previous work on this channel being identified. …
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Measurement and Interpretation of Moments of the Combined Hadronic Mass and Energy Spectrum in Inclusive Semileptonic B-meson Decays
… by theory to constrain assumptions made in the theoretical description of inclusive observables in semileptonic B-meson decays. This description uses Heavy Quark Expansion (HQE), an effective QCD combined with an Operator Product Expansion. The measurement is based on a sample of 231.6 million …
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First Leptonic Probe of Neutron Radii in Lead at Low-Q2
… asymmetry measurement with limited theoretical uncertainties. My dissertation focuses on the study of nuclear structure, namely the thickness of the neutron skin, using elastic electron scattering experiments.</p> <p>The direct measurement of the thickness of the neutron skin in …
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Precision Frontiers in Proton Structure and their Interplay with the Search for New Physics
… that seek to systematically include (i) scale uncertainties and (ii) data from single top production in PDFs for the first time. While, on the topic of improving our ability to characterise new physics, we will present work that assesses the importance of accounting for new physics effects in …
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Clestial harmonics - Applications of Angular Power Spectra to Problems in Astroparticle and Cosmological Physics
… can be understood as the introduction of a theoretical Ansatz concerning the connection between the halos hosting the galaxies and the halos hosting the astrophysical and dark matter UGRB sources. This first idea is combined with the use of a multi-tracer analysis aimed at simultaneously …