| Texto completo | |
| Autor(es): |
Boito, D.
;
Cucchieri, A.
;
London, C. Y.
;
Mendes, T.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of High Energy Physics; v. N/A, n. 2, p. 37-pg., 2023-02-14. |
| Resumo | |
We employ Pade approximants in the study of the analytic structure of the four-dimensional SU(2) Landau-gauge gluon and ghost propagators in the infrared regime. The approximants, which are model independent, serve as fitting functions for the lattice data. We carefully propagate the uncertainties due to the fitting procedure, taking into account all possible correlations. For the gluon-propagator data, we confirm the presence of a pair of com-plex poles at p(pole)(2) = [(-0.37 +/- 0.05(stat) +/- 0.08(sys)) +/- i (0.66 +/- 0.03(stat) +/- 0.02(sys))] GeV2 , where the first error is statistical and the second systematic. The existence of this pair of complex poles, already hinted upon in previous works, is thus put onto a firmer basis, thanks to the model independence and to the careful error propagation of our analysis. For the ghost propagator, the Pades indicate the existence of a single pole at p(2) = 0 , as expected. In this case, our results also show evidence of a branch cut along the negative real axis of p(2). This is corroborated with another type of approximant, the D-Log Pades, which are better suited to studying functions with a branch cut and are applied here for the first time in this context. Due to particular features and limited statistics of the gluon-propagator data, our analysis is inconclusive regarding the presence of a branch cut in the gluon case. (AU) | |
| Processo FAPESP: | 22/02328-2 - Aproximantes racionais em g-2 do múon |
| Beneficiário: | Cristiane Yumi Mise London |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 20/15532-1 - Interação quark-antiquark: a massa do quark top e o propagador do glúon no infra-vermelho |
| Beneficiário: | Cristiane Yumi Mise London |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 21/06756-6 - Testes do modelo padrão: QCD de precisão e g-2 do múon |
| Beneficiário: | Diogo Rodrigues Boito |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2 |