| Texto completo | |
| Autor(es): |
Khemchandani, K. P.
[1]
;
Martinez Torres, A.
[2, 1]
;
Hosaka, A.
[1, 3]
;
Nagahiro, H.
[4, 1]
;
Navarra, F. S.
[2, 1]
;
Nielsen, M.
[2, 1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, Campus Diadema, Rua Prof Artur Riedel, BR-09972270 Diadema, SP - Brazil
[2] Univ Sao Paulo, Inst Fis, CP 66318, BR-05314970 Sao Paulo, SP - Brazil
[3] RCNP, Mihogaoka 10-1, Ibaraki 5670047 - Japan
[4] Nara Womens Univ, Dept Phys, Nara 6308506 - Japan
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | FEW-BODY SYSTEMS; v. 59, n. 3 MAY 2018. |
| Citações Web of Science: | 0 |
| Resumo | |
In this talk I review our recent studies on meson-baryon systems with strangeness -1 and -2. The motivation of our works is to find resonances generated as a consequence of coupled channel meson-baryon interactions. The coupled channels are all meson-baryon systems formed by combining a pseudoscalar or a vector meson with an octet baryon such that the system has the strange quantum number equal to -1 or -2. The lowest order meson-baryon interaction amplitudes are obtained from Lagrangians based on the chiral and the hidden local symmetries related to the vector mesons working as the gauge bosons. These lowest order amplitudes are used as an input to solve the Bethe-Salpeter equation and a search for poles is made in the resulting amplitudes, in the complex plane. In case of systems with strangeness -1, we find evidence for the existence of some hyperons such as: Lambda(2000), Sigma(1750), Sigma(1940), Sigma(2000). More recently, in the study of strangeness -2 systems we have found two narrow resonances which can be related to Xi(1690) and Xi(2120). In this latter work, we have obtained the lowest order amplitudes relativistically as well as in the nonrelativistic approximation to solve the scattering equations. We find that the existence of the poles in the complex plane does not get affected by the computation of the scattering equation with the lowest order amplitudes obtained in the nonrelativistic approximation. (AU) | |
| Processo FAPESP: | 12/50984-4 - Física de hádrons |
| Beneficiário: | Fernando Silveira Navarra |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |