http://www.bdtd.uerj.br/handle/1/3685 Sat, 18 Apr 2026 15:12:45 GMT 2026-04-18T15:12:45Z http://www.bdtd.uerj.br/handle/1/25487 Título: Estudo da produção associada de ψ(2S) e D* em colisões pp com energia de centro de massa de √s = 13 TeV no detector CMS Autor: Kopke, Lucas Coelho Primeiro orientador: Damião, Dilson de Jesus Abstract: The Double Parton Scattering (DPS) production mechanism has become increasingly relevant in the study of heavy-flavor physics, especially in collisions with energies above 1 TeV. In this context, the simulation and analysis of kinematic distributions, as well as the behavior of these distributions in events involving the production of heavy particles in association with open-flavor mesons, are indispensable. Furthermore, due to the rarity of such processes, it is essential to assess the feasibility of their identification in the CMS detector. This study was carried out in the context of the second data-taking period of the collaboration (Run 2), considering exclusively the conditions of the year 2017. The simulation focused on the associated production of ψ(2S) and D*, with the goal of understanding the Monte Carlo (MC) event generation chain and enabling comparative studies of the kinematic distributions from the generation stage to the reconstruction. Instituição: Universidade do Estado do Rio de Janeiro Tipo do documento: Dissertação Mon, 31 Mar 2025 00:00:00 GMT http://www.bdtd.uerj.br/handle/1/25487 2025-03-31T00:00:00Z http://www.bdtd.uerj.br/handle/1/25219 Título: Equações de movimento e transporte semiclássico em sistemas topológicos Autor: Santos, Guilherme Rafael Ferreira dos Primeiro orientador: Barci, Daniel Gustavo Abstract: This work aims to investigate how topology contributes to electronic transport in the presence of a external electromagnetic field. To this end, the evolution of transport models is presented, starting with the classical Drude model, followed by the Sommerfeld model, and subsequently the description of solids through a crystal lattice subjected to a periodic potential. Considering the time-dependent Schrödinger equation, the adiabatic approximation is employed, yielding both the dynamic phase and the geometric Berry phase. It is through the Berry phase that the Berry curvature is determined in the semiclassical equations. From this, the wave packet for the semiclassical regime is constructed, and through the application of the Euler–Lagrange equation to the semiclassical Lagrangian, the semiclassical equations with topology are deduced. These expressions make it possible to describe the Hall effect and to analyze the contribution of the topological magnetic field to electronic transport. Finally, the formalism is applied to the Su–Schrieffer–Heeger (SSH) model, which describes a one-dimensional topological insulator, showing how the band structure and the Berry phase manifest, giving rise to a system with nontrivial topology. Thus, the work provides a conceptual foundation for the introduction of topology in the study of electronic dynamics in solids. Instituição: Universidade do Estado do Rio de Janeiro Tipo do documento: Dissertação Thu, 28 Aug 2025 00:00:00 GMT http://www.bdtd.uerj.br/handle/1/25219 2025-08-28T00:00:00Z http://www.bdtd.uerj.br/handle/1/24785 Título: Paredes de domínio planas na relatividade geral e nas teorias híbridas da gravitação Autor: Silva, Ruan Teixeira da Primeiro orientador: Perez Bergliaffa, Santiago Esteban Abstract: In this work we describe flat domain walls using general relativity and hybrid theories of gravitation that combine the metric and Palatini formalisms. We also analyze these bodies in Minkowski spacetime. The scalar-tensor representation of the hybrid theories is used to facilitate the mathematical calculations. The field equations for the hybrid case were transformed into a single second-order nonlinear differential equation, whose unknowns are three functions that depend on the same variable. These functions are the potential, the scalar field and the metric coefficient. To obtain an equation with one unknown, we imposed two of these functions. This was done twice by imposing distinct pairs and in each case we analyzed the resulting differential equation at points very far from the domain wall and at points very close to the origin. Instituição: Universidade do Estado do Rio de Janeiro Tipo do documento: Dissertação Wed, 30 Jul 2025 00:00:00 GMT http://www.bdtd.uerj.br/handle/1/24785 2025-07-30T00:00:00Z http://www.bdtd.uerj.br/handle/1/24776 Título: Efeitos das interações elétron-elétron na supercondutividade convencional Autor: Vale, Guilherme da Silva do Primeiro orientador: Barci, Daniel Gustavo Abstract: Seeking to contribute to the understanding of the superconductivity phenomenon, we investigate the effects that electron-electron interactions can have on the superconducting phase. We describe the BCS theory of John Bardeen, Leon Cooper, and John Robert Schrieffer, which is used to describe conventional superconductors where superconductivity occurs due to electron-electron coupling caused by phonon sin the lattice of the superconducting material. However, materials that are not described by this theory have attracted much interest since the 1980s, not only because they challenge a well-established theory but also because they exhibit important characteristics, such as the conducting phase at high temperatures. We propose an approach where we construct a model by adding a Fermi liquid-type interaction term to the BCS Hamiltonian. With this, we obtain the self-consistent equations for this model and write a computer program capable of solving them. As a result, we obtain graphs that represent the effects of the Fermi liquid term on the superconducting order parameters. We then point out that this term affects the Fermi surface of the system, potentially deforming it, and that this added term is capable of inducing superconducting phases with different symmetries coexisting. Instituição: Universidade do Estado do Rio de Janeiro Tipo do documento: Dissertação Tue, 14 Jan 2025 00:00:00 GMT http://www.bdtd.uerj.br/handle/1/24776 2025-01-14T00:00:00Z