| Texto completo | |
| Autor(es): |
Ramalho, G.
;
Beck, R
;
Thiel, A
;
Thoma, U
;
Wunderlich, Y
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | RICAP16, 6TH ROMA INTERNATIONAL CONFERENCE ON ASTROPARTICLE PHYSICS; v. 241, p. 9-pg., 2020-01-01. |
| Resumo | |
We present calculations of gamma*N -> N* transition form factors, where N is the nucleon and N* is a nucleon resonance, based on a covariant quark model. Our main focus is at high photon virtualities (large Q(2)) where the valence quark degrees of freedom dominate the contributions to the transition form factors and helicity amplitudes. In that regime, the quark model estimates can be compared with the available data, particularly with the Jefferson Lab data at intermediate and large momentum transfer (Q(2) > 2 GeV2). The main focus is on the Delta(1232)3/2(+), N(1440)1/2(+), N(1535)1/2(-) and N(1520)3/2(-) resonances, but estimates for other higher mass resonances are also discussed. (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 |