| Texto completo | |
| Autor(es): |
Ramalho, G.
Número total de Autores: 1
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| Tipo de documento: | Artigo Científico |
| Fonte: | FEW-BODY SYSTEMS; v. 59, n. 5, p. 20-pg., 2018-09-01. |
| Resumo | |
We discuss the results of the covariant spectator quark model for the several transitions, where N is the nucleon and a nucleon excitation. More specifically, we present predictions for the form factors and transition amplitudes associated with the resonances , , , and . The estimates based on valence quark degrees of freedom are compared with the available data, particularly with the recent Jefferson Lab data at low and large momentum transfer (). In general the estimates are in good agreement with the empirical data for GeV, with a few exceptions. The results are discussed in terms of the role of the valence quarks and the meson cloud excitations for the different resonances . We also review our results for the resonance and discuss the relevance of the pion cloud component for the magnetic dipole form factor and the electric and Coulomb quadrupole form factors. (AU) | |
| Processo FAPESP: | 17/02684-5 - Estudo da estrutura electromagnética e axial de bárions no vácuo e no meio nuclear |
| Beneficiário: | Gilberto Tomás Ferreira Ramalho |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |