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 63 for “"one-loop"”.
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Exact renormalized one-loop quantum corrections to energies of solitonic field configurations
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Rho-Meson propagator at two-loop order in the Kroll-Lee-Zumino quantum field theory
… Despite a large ρππ coupling (gρππ ≈ 5), the loop suppresion factor of 1=(4π)² helps give reasonably small NLO (one-loop) corrections. When it comes to describing hadronic physics, one might say, these one-loop results achieve moderate to excellent success. Where the one-loop results show less …
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TOPICS IN QUANTUM FIELD THEORY
… This effective action is then examined in the loop expansion, where it is demonstrated that the unrenormalized one-loop term is equal to the change in the zero point energy of the theory due to the presence of a non-vanishing background field. The one loop term is carefully evaluated in …
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Worldsheet methods for perturbative quantum field theory
… model to higher genus surfaces; calculating the one-loop NS-NS scattering amplitudes and studying their modular and factorization properties; deriving the one-loop scattering equations and analyzing their factorization; showing that, in the case of the four graviton amplitude, the ambitwistor …
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Analytic progress in open string field theory
… the analytic computation of arbitrary off-shell one-loop open string amplitudes. Finally, I show that this simplicity of Schnabl gauge one-loop Riemann surfaces can be combined with the knowledge of analytic solutions to construct an analytically computable string field theory boundary state. For …
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Topos-like Properties in Two Categories of Graphs and Graph-like Features in an Abstract Category
… a graph is that of a simple graph with at most one loop on any vertex, and the usual notion of a graph homomorphism is a mapping of graphs that sends vertices to vertices, edges to edges, and preserves incidence of the mapped vertices and edges. A more general view is to create a category of …
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Topos-like Properties in Two Categories of Graphs and Graph-like Features in an Abstract Category
… a graph is that of a simple graph with at most one loop on any vertex, and the usual notion of a graph homomorphism is a mapping of graphs that sends vertices to vertices, edges to edges, and preserves incidence of the mapped vertices and edges. A more general view is to create a category of …
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PI-control in dual duct systems : a study on manual tuning and control loop interaction
… autotuners, must be carefully tuned. Also, one must consider the effect of interactions occurring among the control loops during the fine-tuning stage so one loop response is not improved to the detriment of another. This research emphasizes PI-control of dual duct systems. Three tuning …
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Renormalization of cavity field theories
… to a cavity, has always been the divergent loop diagrams. So far, only the quantum chromodynamic and electrodynamic self-energies of a ls1/2 quark, confined to a static spherical cavity, have been accurately calculated. These quantities are of immediate interest in the M.I.T. bag model. The …
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Generalized Compton Amplitudes in Quantum Chromodynamics
… Compton amplitudes. We have calculated the one-loop corrections to the amplitude in the coordinate representation in terms of nonlocal string light-ray operators. We have also developed a consistent approach to the problem of constructing the gauge invariant Compton amplitude and obtained an …
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CP violation in the grimus-neufeld model /
One of the biggest unsolved issues in particle physics is the imbalance between matter and antimatter. This is closely related to the topic of CP violation, which refers to the phenomenon when the same processes treat matter and antimatter particles differently. Searching for the sources of CP …
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Supersymmetric Yang-Mills theories on the lattice
… SYM theories in four and two dimensions. The one-loop renormalization of the lattice four-dimensional SYM theory is investigated. We also study the thermal phase structure of the maximally supersymmetric SYM in two dimensions and possible black hole transitions in its dual gravitational …
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Superfield calculation of loop contribution in extra dimensional theories
… description of supersymmetry representations. Loop corrections with superfield formalism are simpler and much more manageable than calculation in terms of component fields. In this paper we calculate the contribution of the Kaluza-Klein states, associated with extra dimensions, to the …
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A quantum field theory for the interaction of pions and rhos
… are found to be comparable with experiment. The one particle irreducible diagrams that contribute to the one loop corrections to the tree scattering lengths are renormalized.
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Higgs production via weak boson fusion in the Standard Model and the MSSM
… of the Standard Model and the MSSM. Complete one loop results for weak boson fusion at the LHC in the Standard Model are presented. These include the effects of photon radiation and the full virtual electroweak corrections, as well as the QCD corrections (the latter are well known in the …
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The brown muck of b^0 and b^0_s mixing: beyond the standard model
… 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 interactions can …
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Automating methods to improve precision in Monte-Carlo event generation for particle colliders
… approach for a semi-numerically evaluation of one-loop amplitudes is investigated.
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The Use of Operator Regularization in the Computation of Effective Field Theories
… counterpart. This is demonstrated up to two loop order for the case of a charged two field <strong>θ</strong>{4}{4} theory as well as up to one loop order for the Higgs sector of the Minimal Supersymmetric Model. Additionally, the renormalization group functions for the …
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ANALYSIS OF THE BOS ? ?+?- DECAY IN THE MSSM
… expressions for the decay amplitude at the one-loop order have been obtained with the aid of computational tools such as FeynArts, FeynCalc and Looptools. Working in the phenomenological MSSM with reduced parameter space, a simplification of the complete analytical expression was done to …
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