Thesis (Ph. D.)--Florida State University, 2006. / Advisor: Susan K. Blessing, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Sept. 22, 2006). Document formatted into pages; contains xiv, 138 pages. Non-Latin script record Includes bibliographical references.

Orientador: Vicente Pleitez / Banca: Juan Carlos Montero Garcia / Banca: Ricardo D'Elia Matheus / Banca: João Pacheco Bicudo Cabral de Melo / Banca: Marcelo Moraes Guzzo / Resumo: Nós calculamos, no contexto do modelo 3-3-1 com léptons pesados carregados, vínculos sobre alguns dos parâmetros das partículas extras do modelo ao impor que suas contribuições aos fatores (g-2) do elétron e do múon estejam de acordo com os dados experimentais dentro de 1 sigma - 3 sigma. Para obter resultados realistas nós consideramos algumas das possíveis soluções das matrizes unitárias esquerda e direita que diagonalizam as matrizes de massa leptônicas, dando as massas leptônicas observadas e ao mesmo tempo acomodando a matriz de mistura de Pontecorvo-Maki-Nakagawa-Sakata (PMNS). Nós mostramos que, ao menos até a ordem de 1-loop, na faixa de parâmetros explorada, não é possível acomodar simultaneamente os fatores (g-2) do elétron e do múon a não ser que um dos léptons extras tenha massa da ordem de 20-40 GeVs e a escala de energia da simetria 331 esteja em torno de 60-80 TeVs. / Abstract: We calculate, in the context of the 3-3-1 model with heavy charged leptons, constraints on some parameters of the extra particles in the model by imposing that their contributions to both the electron and muon (g ���� 2) factors are in agreement with experimental data up to 1 -3 . In order to obtain realistic results we use some of the possible solutions of the left- and right- unitary matrices that diagonalize the lepton mass matrices, giving the observed lepton masses and at the same time allowing to accommodate the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. We show that, at least up to 1-loop order, in the particular range of the space parameter that we have explored, it is not possible to t the observed electron and muon (g ���� 2) factors at the same time unless one of the extra leptons has a mass of the order of 20-40 GeVs and the energy scale of the 331 symmetry to be of around 60-80 TeVs / Doutor

The first measurement of muon catalyzed dt fusion (dtμ→⁴He+n+μ⁻) in solid HD at ~ 3 K has been performed. The theory describing the formation of the [(dtμ)pee] muonic molecule from the resonant reaction tμ+HD → [(dtμ)pee], a key process in the dt fusion cycle, can now be tested against the experimental results. Using an experimental technique which employs solid layers of hydrogen isotopes, the energy of molecular formation is determined via time of flight, and dt fusion time spectra in solid HD have been measured. The theory describing the resonant formation of the dtμ muonic molecule is compared to the experimental results through Monte Carlo simulations. The energy dependent molecular formation rates calculated for HD at 3 K have been employed in the Monte Carlo with the resultant simulated fusion time spectra in fair agreement with the experimental results. / Graduate

The positive muon is an unstable (Tµ =2.2µsec) particle but one with properties very similar to the proton from a chemical and atomic physics point of view. It has, however, a mass only 1/9 that of the proton, a fact which makes it ideal for studying any mass dependence in chemical and physical phenomena. The µSR and MSR techniques have been utilized to study various relaxation phenomena that occur in the gas phase when the muon or muonium (the muon and electron bound state analogous to the hydrogen atom) interacts with its environment. The fraction of muons that thermalize as muonium has also been measured. It was found that 83% of the muons stopping in n₂ formed muonium, the remainder staying in the charged state. Other gases investigated were H₂ (61 %) , CH₄ (86%), NH3(90%), He(0%), Ne(4%), Ar(74%), Kr(100%) and Xe100%). The amplitude of the signal was found to be strongly pressure dependent and this has been explained in terms of the thermalization time of the muons in these gas targets. Various gas mixtures were also studied where it was found that relaxations of the µSR signal occured as a function of added reagent gas concentration. This phenomena has been attributed to reactions of muon molecular ions with the reagent gas, forming muonium thermally. This represents the first reliable measurements of muon relaxation in the gas phase. Evidence is presented indicating that such reactions occur from the first vibrational state of these muon molecular ions. The systems studied and their room temperature rate constants The spin exchange interactions of muonium with NO and 0₂ were also studied as a function of temperature in the range 295K to 478K. The measured rate constants exhibit a temperature dependence consistent with T ½ and hence a constant spin exchange cross section. The temperature averaged spin exchange cross sections found are: for Mu+O₂, 6~SE=9.0±1x10⁻¹⁶cm² and for Mu+NO, 6se = 1 0 . 5±1 x ⁻¹⁶cm². These values are essentially the same as the cross sections found for hydrogen atom spin exchange with the same molecules, in qualitative agreement with current theoretical predictions. / Science, Faculty of / Chemistry, Department of / Graduate

This thesis contains a study of the effects of massive Dirac and Majorana neutrinos and their mixings in the e’ spectrum for the muon decay μ⁺→e⁺ v[sub=e]v[sub=μ] (v[sub=μ; sup=c]. The spectra for both polarized and unpolarized muons are given for the three-neutrino world with a single neutrino of mass in the MeV/c² range. Electron-neutrino correlations are calculated and proposed as a possible signature of Majorana neutrinos. The first-order radiative corrections to the muon decay and the radiative decay μ⁺→e⁺ v[sub=e][v=sub u] are included in this analysis for the case of a single Dirac neutrino of mass in the MeV/c² range mixing into the three-neutrino world. The method of dimensional regularization is used for the calculation of the radiative corrections. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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Reproduction de : Thèse de doctorat : Physique Corpusculaire : Clermont-Ferrand 2 : 2005. / Thèse avec annexes. Titre provenant de l'écran-titre. Bibliogr. p. 183-188.

Reproduction de : Thèse de doctorat : Physique nucléaire : Lyon 1 : 2005. / Titre provenant de l'écran titre. 133 réf. bibliogr.

Thesis--Ph. D., University of Hong Kong.