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 87 for “"PDFs"”.
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Factorization at the LHC : from PDFs to initial state jets
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.
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ADVANCEMENTS IN PDFS DETERMINATION: INCORPORATION OF QED EFFECTS AND NEW THEORETICAL IMPROVEMENTS IN A MODERN DEEP LEARNING FRAMEWORK
… determination of parton distribution functions (PDFs) through the inclusion of new theoretical effects in the theoretical predictions that are compared to experimental data. Such effects are the inclusion of Quantum Electrodynamics (QED) corrections, the inclusion of the so-called missing higher …
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Parton Distributions in Beyond the Standard Model Theories
… Standard Model (BSM) physics if these SM-like PDFs are used in these analyses. It is important to quantify the extent to which this occurs, in order to avoid making incorrect conclusions about BSM physics. We begin in Chapter 1 with a review of perturbative quantum chromodynamics (QCD) and …
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Global Standard Model analyses for new physics searches
… of the Parton Distribution Functions (PDFs), which describe the structure of the proton. We explore the interplay between PDFs and the SMEFT in global analyses, presenting a realistic risk assessment that demonstrates how energy-growing BSM effects can be absorbed within the PDFs and …
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Precision phenomenology of the PDF-BSM interplay
… in terms of parton distribution functions (PDFs). PDFs, essential ingredients in theoretical predictions, cannot be calculated from first principles and must be extracted from fits to experimental data. Despite the immense success of the SM, we know that it cannot be the most complete theory …
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Precision QCD and effective field theories with machine learning
… therein are the parton distribution functions (PDFs) which parameterize the proton structure in terms of its elementary quark and gluon constituents. These quantities are non-perturbative and obtained from data using a global QCD analysis. In tandem, Effective Field Theories (EFTs), provide a …
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An Empirical Comparison of Four Data Generating Procedures in Parametric and Nonparametric ANOVA
… valid or invalid probability density functions (PDFs). Specifically, the data generating procedures will produce distributions with valid PDFs if and only if the transformations are strictly increasing - otherwise the distributions are considered to be associated with invalid PDFs. As such, the …
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STATISTICAL LEARNING FOR STANDARD MODEL PHENOMENOLOGY
… determination of parton distribution functions (PDFs), with a particular emphasis on modern machine learning tools used within the NNPDF approach. We first present NNPDF4.0, currently the most recent and most precise set of PDFs based on a global dataset. We then provide suggestions for …
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Probabilistic photometric redshifts in the era of petascale astronomy
… and analyzing all of these photometric redshift PDFs will be non-trivial, and this challenge becomes even more severe if a survey plans to compute and store multiple different PDFs. In this thesis, we have developed an end-to-end framework that will compute accurate and robust photometric …
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Inverting multivariate analytic characteristic functions with financial applications
… for characteristic functions, the underlying pdfs and cdfs have exponential tails. The inversion from multivariate characteristic functions to the corresponding pdfs and cdfs can be approximated by the trapezoidal rule conveniently with great accuracy. Monte Carlo methods can be applied for …
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Measurement of the Drell--Yan differential cross section with the CMS detector at the LHC
… known as parton distribution functions (PDFs) which parameterize the structure of the proton. In addition to the differential cross sections, the measurements of ratios of the normalized differential cross sections (double ratios) at √<em>s</em> = 7 and 8\TeV are performed in order to …
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KNN Query Processing in Wireless Sensor and Robot Networks
… from each robot. Partial Depth First Search (PDFS) attempts to traverse all the robots of interest with a query message to gather the data by depth first search. This thesis also optimizes a traditional itinerary-based KNN query processing method called IKNN and compares this algorithm with …
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Raman Spectroscopy and Synchrotron X-ray Diffraction Study of Lunar and Terrestrial Plagioclase Feldspar at High-Pressure and High-Temperature Conditions
… glass. However, no planar deformation features (PDFs) were observed in plagioclase despite finding PDFs in quartz in the same thin section in Mistastin Lake central uplift samples. Certain features observed in plagioclase (e.g., twinning, needle like inclusions, zeolite alteration and crystalline …
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Effective Field Theories for Physics Beyond the Standard Model
… of the parton distribution functions (PDFs) and the SMEFT using data from the high-mass tails of Drell-Yan distributions. These observables provide crucial constraints on energy-growing four- fermion EFT operators, while also constraining light quark PDFs in the large-x region. By …
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Study on impacts of aviation emissions and related dynamics and chemistry
… profiles of probability density functions (PDFs) of chemical tracers simulated by the MOZART-3.1 are quantitatively compared with satellite data from the Microwave Limb Sounder (MLS) instrument in the tropopause relative altitude to characterize features of tracer distributions near the …
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Large Eddy Simulations of Particle Dispersion and Deposition in a Turbulent Square Duct Flow
… collision algorithm has been developed. PDFs of deposition location, average streamwise and wall-normal deposition velocities, and deposition rates are presented.
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Prediction of Laser Ablation In Brain: Sensitivity, Calibration, and Validation
… Uniform probability distribution functions (PDFs) capture the plausible range of values suggested by the literature for five model parameters. The five PDFs are input separately into the FEM model to gain a probabilistic sensitivity response of the model to the input PDFs. The result …
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Moments of parton distribution amplitudes and structure functions for the light mesons from lattice QCD
… processes and the parton distribution functions (pdfs) that appear in inclusive processes. The PDA’s provide process independent partonic information about hadrons and are important quantities required for the calculation of weak physics parameters, such as CKM matrix elements and CP violating …
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Sea ice thickness and iceberg distribution in the Southern Ocean
… the eastern Amundsen Sea during March 2003. The PDFs for all missions were found to have a single mode although there is evidence for variability in mean thickness along the ice front, as the most western mission has a lower mean draft. Geostatistical analyses of the data have allowed the …
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The Influence of Sea-Level Rise on Salinity in the Lower St. Johns River and the Associated Physics
… into probability distribution functions (PDFs) and eigen-functions. The same analysis is performed on synthetic salinity records generated by the model when applied in forecast mode (i.e., sea-level rise). Comparisons of the forecasted PDFs and eigen-functions with those for present-day …
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