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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2012.tde-25032013-145421
Document
Author
Full name
Gabriel Chicca Santucci
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Burdman, Gustavo Alberto (President)
Nielsen, Marina
Novaes, Sergio Ferraz
Title in Portuguese
Procura de novos bósons vetoriais no LHC
Keywords in Portuguese
bósons
física de partículas
subestrutura de jatos
Abstract in Portuguese
Neste trabalho estudou-se a fenomenologia da observação de novos bósons vetoriais com massa da ordem de 1 TeV no LHC. Em particular, a análise foi feita para um bóson vetorial neutro que se acopla com os bósons carregados do Modelo Padrão e esses bósons decaem hadronicamente deixando uma assinatura com jatos no detector. Esse tipo de sinal possui um enorme fundo de QCD devido ao ambiente hadrônico intrínseco ao LHC, de maneira que o uso de técnicas de análise de subestrutura de jatos se tornam indispensáveis. A motivação do trabalho vem dos modelos com dimensões extras curvas que possuem torres de Kaluza-Klein de novos bósons de gauge. Estes são responsáveis por garantir a unitariedade nos espalhamentos dos bósons vetoriais do MP, estudamos em especial a primeira excitação do 'Z POT. 0', o bóson 'Z POT. 1'. Na análise fenomenológica vericamos que o LHC possui um grande potencial de descoberta e exclusão dessas classes de modelos além do MP. Para tanto estudamos o sinal pp -> 'Z POT. 1' -> WW -> jatos e os processos do MP do tipo pp -> jatos, com pelo menos dois jatos na janela de massa do W. Vericamos que para um 'Z POT. 1' de largura 'M IND. z 'IND. 1'/10, com massa da ordem de 1 TeV e acoplamentos da ordem de '10 POT. 3' vezes menores que os acoplamentos do MP é possível observá-lo no LHC com 30 'fb IND. -1' de luminosidade integrada com 14 TeV de energia no centro de massa.
Title in English
Search for new vector bosons of the LHC
Keywords in English
bosons
jets substructure
particle physics
Abstract in English
In this work we present a phenomenological study of the observation of new vector bosons with mass around 1 TeV at the LHC. We analyse a neutral vector boson that couples to the charged bosons of the Standard Model and this bosons decay hadronically leaving a multiple jets signature on the detector. This kind of signal has an enormous QCD background due to the hadronic enviroment of the LHC, making the analysis of jet substruture indispensable. The motivation for this work comes from warped extra dimensions models, wich have Kaluza-Klein towers of new gauge bosons. These are responsable for assuring the unitarity of the vector bosons scatterings in the SM. We studied the first excitation of the Z0 bosons, the Z1 boson. We veried that the LHC has a great potential of discovery or exclusion for this classes of theories beyond the SM. For the analysis, we studied the process pp -> Z1 -> WW -> jets and the background processes of the SM of the type pp -> jets, with at least two jets in the W mass window. We veried that for a Z1 with width MZ1/10 , mass of O(1 TeV) and couplings 10^3 times more weakly than those of the SM, it is possible to observe it in the LHC with 30 fb-1 of integrated luminosity in the 14 TeV run.
 
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Publishing Date
2013-05-29
 
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