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 53 for “"effective theory"”.
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Weak Decay Studies From An Effective Theory Standpoint
… using a model independent approach by employing effective field theories. I discuss the soft photon contribution and background effect to the rare dimuonic decay of the neutral B meson. I also study some radiative exclusive W boson decays in the standard model in the context of pQCD and SCET. …
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Wilson loops effective theory and gauge-gravity duality
Esta tesis estudia cómo obtener una acción efectiva para el dual holográfico de líneas de Wilson en teorías de campos no conformes y fuertemente acopladas y algunas aplicaciones del mecanismo obtenido. Encontramos una acción efectiva para una cuerda dual a la línea de Wilson usando el mecanismo de …
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Heavy quark symmetry in the soft collinear effective theory
… final state. An introduction to Soft Collinear Effective Theory (SCET), the appropriate effective field theory of QCD for such decays, is given. We focus on decays of the type ... where M is a light energetic meson of energy E. The SCET formulates the problem as an expansion in powers of where Q …
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A New Formalism for Soft Collinear Effective Theory with Applications
In this thesis a new formalism for Soft Collinear Effective Theory (SCET) is developed and a new calculation relevant to high-precision studies of Quantum Chromodynamics (QCD) involving the summation of Sudakov double logarithms is presented. The new formalism of SCET possesses certain desirable …
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Bödeker's Effective Theory: From Langevin Dynamics to Dyson-Schwinger Equations
… in the early Universe. Bödeker has derived an effective theory that describes the dynamics of the soft field modes to leading logarithmic order by means of a Langevin equation. This effective theory has been used for lattice calculations so far. In this work we provide a complementary, more …
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Characteristic polynomials of random matrices and their role in an effective theory of strong interactions
… of random matrix models, with applications in effective field theory models of Quantum chromodynamics (QCD). The symmetries of the field theory lead to random matrix ensembles named chiral Gaussian Unitary Ensemble (chGUE(N)) and extensions thereof. The random matrix ensembles are comparable to …
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Study of a short distance top mass with a cross-section at NNLL + NNLO
… are well separated and can be disentangled with effective theory methods such as the Heavy-Quark Effective Theory and Soft-Collinear Effective Theory. We compute a top mass observable for future e+e- colliders to next-to-next-to-leading-logarithmic order + [Omicron] [alpha] 2/[sigma](NNLL+NNLO), …
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Colliding branes and formation of spacetime singularities in superstring theory.
… made, in the framework of 10-dimensional string theory. After developing the general formulas to describe such events, we study several classes of exact solutions and space-time singularities in both the (D+d)-dimensional string theory and its D-dimensional effective theory, obtained by …
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A Relativistic Model for Heavy Mesons
… by the present interest in the heavy quark effective theory, we construct a model for heavy mesons based on a relativistic bound state wave equation, the Gross equation. The kernel we use is based on scalar confining and vector Coulomb potentials. Wave functions are treated to leading order …
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Modeling Compact Objects with Effective Field Theory
… master's thesis we have developed a worldline Effective Field Theory of compact objects, by extending the model of spinning extended objects derived using the coset construction [1], from which one can derive the effective theory from symmetry principles. To massive spinning extended objects, …
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Probing the topology in band insulators
… phases described by the traditional Landau theory of symmetry breaking, the topological phases do not break symmetry, and it is not obvious in which measurable quantity will the topological index manifest itself. In this thesis, our main goal is to understand how topological classification …
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Causal and stable stochastic relativistic hydrodynamics
… results to the nonlinear regime, we consider effective action approaches. The standard procedures can lead to a non-convergent path integral and non-positive definite noise, so we introduce a new effective theory based on Crooks fluctuation theorem. This effective theory is applied to …
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Effective field theories for the LHC
In this thesis I study applications of effective field theories to understand aspects of QCD jets and their substructure at the Large Hadron Collider. In particular, I introduce an observable, D2 , which can be used for distinguishing boosted W/Z/H bosons from the QCD background using information …
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Off-shell pion electromagnetic form factors in chiral perturbation theory
… pion form factors using chiral perturbation theory, which is the effective theory for QCD at low energies. Chiral perturbation theory has previously been used to calculate the on-shell form factors. The formalism is here described, and it is modified to accomodate possible off-shell …
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Relevant Operators of Particle Physics and Cosmology
… performed to this date, it can only be an effective theory of fundamental physics. However, treating the Standard Model this way brings its own set of challenges; namely, the coefficients of relevant operators become extremely sensitive to UV physics. The relevant operator of the Standard …
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Precision determination of the strong coupling constant
… advantage of the formalism of Soft Collinear Effective Theory (SCET), an effective theory of the strong interactions appropriate for describing energetic jets. We give a factorization theorem for the process e+e- to hadrons, valid in the whole range of thrust values. This factorization theorem …
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A Quantum Monte Carlo approach to dark matter-nuclei interaction
… are obtained to next-to-leading order in chiral effective theory, and they are derived from a DM-quark and DM-gluon effective interaction. The nuclear ground states wave functions are obtained from a phenomenological nuclear Hamiltonian, composed of the Argonne $v_{18}$ two-body interaction and …
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Chiral symmetry breaking transitions in holographic duals
… magnetic field. We explore the low energy effective theory of the pions of these models deriving simple integral equations for low energy parameters in the spirit of constituent quark model results. We also explore the phase structure of these models, with respect to temperature, chemical …
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Re-considering the limits and conditions of possibility of Foucault's understanding of the subject
… Last, the way in which the perquisite of effective theory limits the meaning of Foucault's.
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Fermionic superfluids : from cold atoms to high density QCD : gapless (breached pair) superfluidity and kaon condensation
… approximation to the low-energy chiral effective theory of pseudo-Goldstone bosons, and we extract the numerical coefficients of the lowest order effective potential.
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