Tese de Doutorado #273: Adriano Cherchiglia
Momentum Routing Invariance in Feynman diagrams and Symmetries as a guide to regularization ambiguities: Standard and Beyond Standard Model examples
Autor: Adriano Lana Cherchiglia
Banca Avaliadora
Marcos Donizeti Rodrigues Sampaio (orientador)
Física - UFMG
Ricardo Schwartz Schor
Física - UFMG
Antônio Sérgio Teixeira Pires
Física - UFMG
José Abdalla Helayel Neto
CBPF
Heron Carlos de Godoy Caldas
DF/UFSJ
Orientadores
Marcos Donizeti Rodrigues Sampaio (orientador)
Departamento de Física - UFMG
Resumo do Trabalho
In this thesis we present a general view on regularization ambiguities and develop a systematization on how such ambiguities can be related to momentum routing invariance of Feynman diagrams and symmetries. We apply our formalism to a variety of theories and examples such as: the Higgs boson decay to two photons, the two photon scattering, induction (or not) of a Chern-Simons tem on gravitational effective models, supersymmetric electrodynamics and the anomaly puzzle. We also study the role played by quadratic divergences on a variety of examples showing its connection (or not) to the ambiguities aforementioned.