O vértice D*Dp usando as regras de soma da QCD

• Ano de defesa: 2010
• Autor(a) principal: Rodrigues, Bruno Osório
• Orientador(a): Bracco, Mirian Enriqueta
• Banca de defesa: Chiapparini, Marcelo , Borges Filho, José de Sá , Szpigel, Sérgio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Física
• Departamento: Centro de Tecnologia e Ciências::Instituto de Física Armando Dias Tavares
• País: BR
• Palavras-chave em Português: Física Hadrônica; Regras de soma da QCD; Fator de forma; Constante de acoplamento forte; Vértice D*Dp
• Palavras-chave em Inglês: Hadronic Physics; QCD sum rules; Form factor; Strong coupling constant; D*Dp vertex
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA NUCLEAR
• Link de acesso: http://www.bdtd.uerj.br/handle/1/12960

The particle physics have been studying topics like the Quark-Gluon Plasma (QGP), Higgs boson and dark matter, which require experiments in heavy-ion collisions. Therefore, accelerators capable of generate high energy particle beams are necessary and may generate new physics. When new data arise in the laboratories, new processes are necessary to explain this data and sometimes, the internal structure of the involved particles is unknow or are virtual. In the theoretical models, used to describe this scattering processes, is common to introduce the form factors. The form factor is a way to simulate the sub-structure of the involved particles as function of energy or momentum. The form factor can be obtained using a method called QCD Sum Rules (QCDSR). In this work, the vertex D*Dp will be studied using the QCDSR, in order to obtain its form factors and coupling constant.The D*Dp vertex is very important to understand the ρπ Puzzle, where the Ј/ψ meson decays in ρπ with a branching ratio bigger than expected (this is a suppressed process by the OZI Rule). Studying this process with hadronic degrees of freedom, it s possible to escape of the OZI rule, once the Ј/ψ→ D¯D → ρπ is not suppressed by the OZI rule. In this process, the D*Dp vertex is necessary. There are other processes where this vertex is necessary: X(3872)→Ј/ψp and B→Ј/ψ¯D for example. In this work, was only possible to obtain results from the ρ off-shell diagram. This results were compared with others obtained in the literature.