Reproduction de : Thèse de doctorat : Physique : Lyon 1 : 2004. / Titre provenant de l'écran titre. 129 réf. bibliogr.

Orientador: Sérgio Ferraz Novaes / Banca: Manuel Drees / Banca: Vicente Pleitez / Banca: Carlos Ourívio Escobar / Banca: Takeshi Kodama / Resumo: 0 Modelo Padrão é, hoje em dia, a melhor formulação teórica para a descrição das interações eletrofracas. 0 acordo entre resultados experimentais e previsões teóricas é expressivo para acoplamentos entre bósons vetoriais e férmions. Porém, possuímos poucas informações sobre o bóson de Higgs, remanescente do mecanismo de quebra de simetria eletrofraca responsável pela geração das massas dos férmions e dos bósons vetoriais. Neste trabalho procuramos explorar alternativas para os acoplamentos do bóson de Higgs aos demais bósons da teoria através do uso de lagrangeanas efetivas. Examinamos as consequências destas novas interações em diversas reações envolvendo a produção e decaimento do bóson de Higgs em colisões elétron-pósitron e hadrônicas. 0 estudo dessas reações nos permite impor vínculos sobre as constantes de acoplamento destas novas interações, os quais são comparados com os limites experimentais das constantes de acoplamento da parametrização convencional dos auto-acoplamentos entre os bósons vetoriais IVWZ e W'gama'. / Abstract: The Standard Model is the best theoretical framework which describes the elec- troweak interactions. The agreement between experimental data and theoretical predictions is spectacular for the fermion-vector boson couplings. However, we have few information concerning the electroweak symmetry breaking sector of the theory. In this Work we explore diíferent possibilities for the couplings among the Higgs boson and the vector bosons of the theory through the use of the effective lagrangian formalism. We examine the consequences of these new interactions in several re- actions involving the Higgs boson production and decay at electron-positron and hadronic collisions. We analyze these reactions in order to impose bounds on the coupling constants of these new interactions. These bounds are compared with the experimental limits on the usual parametrization of the anomalous WWZ and WW'gama' / Doutor

The spin states of W bosons in e+e- -t W+W- -t q$tvc events recorded by the OPAL detector at LEP are determined by an analysis of the angular distributions of their d e cay products. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e+e- collisions with centre-of-mass energies between 183 GeV and 209 GeV. The average percentage of longitudinally polarised W bosons measured from the data is found to be (23.9 f 2.1 + 1.1)% compared to a Standard Model prediction of (23.9 f 0.1)%. All results are consistent with CP conservation.

A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2014. / This thesis presents multiple studies contributing to the research conducted at the ATLAS experiment at the CERN facility in Switzerland. The areas of contribution include the ATLAS physics validation developments and the Standard Model Higgs boson decaying to two tau leptons search e ort. A section outlining the use and maintenance of the ATLAS TauValidation package details contributions made towards the ATLAS physics validation program.

Reproduction de : Thèse de doctorat : Physique nucléaire : Lyon 1 : 2002. / Titre provenant de l'écran titre. 62 réf. bibliogr.

Thesis (M. Phil.)--University of Hong Kong, 1977.

Not available / text

published_or_final_version / Physics / Master / Master of Philosophy

Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 147-150).

Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Duane A. Dicus. Vita. Includes bibliographical references.