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Título: | Meson-baryon bound states in a (2+1)-dimensional strongly coupled lattice QCD model. |
Autor(es): | Francisco Neto, Antônio |
Data do documento: | 2004 |
Referência: | FRANCISCO NETO, A. Meson-baryon bound states in a (2+1)-dimensional strongly coupled lattice QCD model. Physical Review D, v. 70, n. 037502, p. 1-4, 2004. Disponível em: <https://journals.aps.org/prd/abstract/10.1103/PhysRevD.70.037502>. Acesso em: 20 jul. 2017. |
Resumo: | We consider bound states of a meson and a baryon ~meson and antibaryon! in lattice QCD in a Euclidean formulation. For simplicity, considering the 1 parity sector we analyze an SU(3) theory with a single flavor in 211 dimensions and two-dimensional Dirac matrices. We work in the strong coupling regime, i.e., in a region of parameters such that the hopping parameter k is sufficiently small and k@g0 22, where g0 22 is the pure gauge coupling. There is a meson ~baryon! particle with asymptotic mass 22 lnk (23 lnk) and an isolated dispersion curve. Here, in a ladder approximation, we show that there is no meson baryon ~or meson-antibaryon! bound state solution to the Bethe-Salpeter equation up to the meson-baryon threshold (;25 lnk). The absence of such a bound state is an effect of a spatial range-one repulsive potential that is local in space at order k 3, i.e., the leading order in the hopping parameter k . |
URI: | http://www.repositorio.ufop.br/handle/123456789/8743 |
Link para o artigo: | https://journals.aps.org/prd/pdf/10.1103/PhysRevD.70.037502 |
DOI: | https://doi.org/10.1103/PhysRevD.70.037502 |
ISSN: | 2470-0029 |
Aparece nas coleções: | DEPRO - Artigos publicados em periódicos |
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