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Master's Dissertation
DOI
10.11606/D.43.2018.tde-03052018-135121
Document
Author
Full name
Eduardo da Silva Almeida
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Eboli, Oscar Jose Pinto (President)
Alves, Alexandre
Novaes, Sergio Ferraz
Title in Portuguese
Limites de unitariedade para vértices quárticos anômalos
Keywords in Portuguese
Modelo Padrão
teorema ótico e vértices quárticos anômalos.
unitariedade
Abstract in Portuguese
Neste trabalho consideramos extensões do Modelo Padrão contendo vértices quárticos anômalos parametrizados por operadores efetivos de dimensão oito. Estes alteram o comportamento das amplitudes do tipo VV VV , onde V pode ser o fóton, o bóson Z, o bóson W ou o Higgs. Para essa extensão ser consistente, ela tem que obedecer o teorema ótico. Entretanto, as amplitudes geradas por estes operadores efetivos tendem a aumentar conforme a energia do centro de massa aumenta. Estudaremos o comportamento dessas amplitudes e determinaremos se há violação de unitariedade. Para isso utilizamos também o formalismo da base de helicidade.
Title in English
Unitarity Limits on Anomalous Quartic Vertex
Keywords in English
anomalous quartic vertex.
optical theorem
Standard Model
unitarity
Abstract in English
In this work we consider Standard Model extensions containing anomalous quartic vertex parametrized by effective dimension-eight operators. These modify the behaviour of the scat- tering amplitudes VV VV , where V can be photon, Z boson, W boson and Higgs. To this extension be consistent, it has to obey the optical theorem. However, the amplitudes generated by these effective operators tends to grow as the center of mass energy increase. We will study the behaviour of these amplitudes and we will determine if there is unitarity violation. For this it was also used the helicity base formalism.
 
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Publishing Date
2018-05-04
 
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