New calculation techniques and precision physics in high energy colliders
Metadatos
Afficher la notice complèteAuteur
Donati, Alice MariaEditorial
Universidad de Granada
Director
Pittau, RobertoDepartamento
Universidad de Granada. Departamento de Física Teórica y del CosmosMateria
Correcciones radiativas Alta energía Análisis dimensional Colisionadores de hadrones Aceleradores de partículas Teoría cuántica de campos
Materia UDC
53 22
Date
2016Fecha lectura
2015-10-30Referencia bibliográfica
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]
Patrocinador
Tesis Univ. Granada. Programa Oficial de Doctorado en: Biología Fundamental y de Sistemas; Proyecto de InvestigaciónRésumé
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.