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 145 for “"parton"”.
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Applying SCET to parton showers
In this thesis we study corrections to parton showers in the context of soft collinear effective theory (SCET). Monte Carlo event generators like Pythia or Herwig are heavily used by experimentalists to simulate events and they are indispensable tools to make exclusive theoretical predictions. They …
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Double parton scattering in proton-proton collisions
Double hard parton-parton interactions are expected to occur frequently in proton-proton (p-p) collisions at the LHC. They can give rise to significant backgrounds to certain rare single scattering (SPS) signals, and are an interesting signal process in their own right. In this thesis, we discuss …
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Exclusive Production of Quarkonia and Generalized Parton Distributions
… Utilizing the framework of Generalized Parton Distributions enables predictions to be made if some information on them is known. We investigated exclusive photo and electroproduction of heavy vector mesons (the quarkonia J/ψ and ϒ), which can give access to the currently poorly …
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Parton Distributions in Beyond the Standard Model Theories
Parton distributions are a key ingredient 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) …
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Measurement of polarized parton distributions with spin-dependent deep-inelastic scattering
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Energy loss and equilibration of a highly energetic parton in QCD plasmas
While a hard parton (gluon or quark) traverses the medium, it loses its energy as a result of interactions with the medium. In this thesis, we describe the full in-medium kinetic and chemical equilibration of hard particles, using a linearized effective kinetic description of QCD at leading order. …
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Towards a spacetime description of hard parton evolution in the quark gluon plasma
… for the Energy Momentum Tensor of hard partons created before the formation of the Quark Gluon Plasma. We propose this as a foundational model to use as an initial condition in jet energy loss calculations.
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Moments of parton distribution amplitudes and structure functions for the light mesons from lattice QCD
… two hadronic structure quantities. These are the parton distribution amplitudes (PDAs) which enter in the form-factor for exclusive scattering processes and the parton distribution functions (pdfs) that appear in inclusive processes. The PDA’s provide process independent partonic information about …
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Study of parton energy loss in heavy ion collisions using charged particle spectra measured with CMS
… to constrain the path length dependence of parton energy loss. The strength of energy loss is found to increase with both [square root of SNN and the average path length through the QGP. Comparisons to theoretical models and previous measurements indicate that the path length dependence is …
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Exploring proton structure using lattice QCD
We calculate moments of the generalized parton distributions of the nucleon using lattice QCD. The generalized parton distributions determine the angular momentum decomposition of the nucleon and the transverse distributions of partons within the nucleon. Additionally, the generalized parton …
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Inclusive and Exclusive Compton Processes in Quantum Chromodynamics
… analyze the process in the framework of the QCD parton model, in which the usual parton distributions emerge as a tool to describe the nucleon in terms of quark and gluonic degrees of freedom. To study its exclusive version, a new class of phenomenological functions is required, namely, …
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Probing parton distributions in proton using Drell-Yan and charmonium production in p + p and p + d interactions with 120 GeV proton beam at Fermilab
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Probing parton distributions in proton using Drell-Yan and charmonium production in p + p and p + d interactions with 120 GeV proton beam at Fermilab
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Virtual Compton Scattering Processes in Quantum Chromodynamics
… processes require a generalization of usual Parton distributions for the case when long-distance information is accumulated in nonforward matrix elements [special characters omitted] of quark and gluon light-cone operators. We consider different aspects of the investigation of the virtual …
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Monte Carlo simulations of hard QCD radiation
… of high-multiplicity final states is the parton shower. There has been much recent progress improving the parton shower description of hard radiation using exact matrix elements. This thesis describes research into implementing and improving such methods within the Herwig++ event …
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Finite-temperature quantum field theory and the structure functions of the nucleon
… of features which are absent in the parton model. These include the presence of identical quarks and gluons in initial and final states and of quantum statistical correlations which have a role to play in the propagation of particles when considering Feynman diagrams containing …
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Model-independent approaches to QCD and B decays
… are calculated and depend on twist-2 two-parton and twist-3 three-parton distributions. We demonstrate that non-perturbative strong phases in annihilation are suppressed. Using simple models, we find that the three-parton and two-parton terms have comparable magnitude, both consistent with …
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Study of high transverse momentum charged particle suppression in heavy ion collisions at LHC
… (PT), dominated by hadrons originating from parton fragmentation, is an important observable for studying the properties of the hot, dense medium produced in high-energy heavy-ion collisions. The study of the modifications of the PT spectrum in PbPb compared to pp collisions at the same …
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