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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/42675

Title: New calculation techniques and precision physics in high energy colliders
Other Titles: Nuevas técnicas de cálculo y física de precisión en los colisionadores de alta energía
Authors: Donati, Alice Maria
Direction: Pittau, Roberto
Collaborator: Universidad de Granada. Departamento de Física Teórica y del Cosmos
Issue Date: 2016
Submitted Date: 30-Oct-2015
Abstract: In this thesis we have studied, tested, and developed the four dimensional regularization/renormalization (FDR) scheme, a novel approach to the calculation of radiative corrections in perturbative quantum field theory (pQFT), a task that is primarily hindered by the presence of unphysical infinities emerging from loop and phase space integration. Unlike the methods traditionally used to cope with this problem, in FDR the subtraction of the ultraviolet (UV) divergences is built in the definition of a new loop integral, made finite at the integrand level, and without ever modifying the Lagrangian. The method is fully four-dimensional, and it automatically preserves gauge invariance, as we have verified by calculating the one-loop amplitude for H ! !! in arbitrary gauge. By studying the gluonic corrections to the top-loop induced H ! !! process, we have also shown that FDR is particularly convenient when applied to two-loop calculations, as it avoids a great deal of the work that in dimensional regularization (DR) is induced by "/" terms. Infrared (IR) singularities in virtual and final state real radiation can also be cured in the same framework; the matching and cancellation of this type of divergence in inclusive observables was also studied, by reviewing the analytic calculation of the next-to-leading-order (NLO) decay rate for H ! gg, and by applying to this same process some FDR-based numerical Monte Carlo (MC) methods.
Sponsorship: Tesis Univ. Granada. Programa Oficial de Doctorado en: Biología Fundamental y de Sistemas
Proyecto de Investigación
Publisher: Universidad de Granada
Keywords: Correcciones radiativas
Alta energía
Análisis dimensional
Colisionadores de hadrones
Aceleradores de partículas
Teoría cuántica de campos
UDC: 53
URI: http://hdl.handle.net/10481/42675
ISBN: 9788491255437
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Donati, A.M. Nuevas técnicas de cálculo y física de precisión en los colisionadores de alta energía. Granada: Universidad de Granada, 2016. [http://hdl.handle.net/10481/42675]
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