Bound state structure and electromagnetic form factor beyond the ladder approximation

Autor(es)

Gigante, V. ; Alvarenga Nogueira, J. H. ; Ydrefors, E. ; Gutierrez, C. ; Karmanov, V. A. ; Frederico, T.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW D; v. 95, n. 5, p. 11-pg., 2017-03-10.

Resumo

We investigate the response of the bound state structure of a two-boson system, within a Yukawa model with a scalar boson exchange, to the inclusion of the cross-ladder contribution to the ladder kernel of the Bethe-Salpeter equation. The equation is solved by means of the Nakanishi integral representation and light-front projection. The valence light-front wave function and electromagnetic form factor, considering both ladder and ladder plus cross-ladder kernels, are studied in detail. Their asymptotic forms are found to be quite independent of the inclusion of the cross-ladder kernel, for a given binding energy. The asymptotic decrease of form factor agrees with the counting rules. This analysis can be generalized to fermionic systems, with a wide application in the study of the meson structure. (AU)

• Processo FAPESP: 15/22701-6 - Teoria relativística de poucos corpos a suas aplicações em hádrons e no núcleo
• Beneficiário: Tobias Frederico
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 14/19094-8 - Decaimentos de mésons pesados em três corpos e violação CP
• Beneficiário: Jorge Henrique de Alvarenga Nogueira
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto