| Texto completo | |
| Autor(es): |
de Paula, W.
;
Ydrefors, E.
;
Nogueira, J. H. Alvarenga
;
Frederico, T.
;
Salme, G.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 105, n. 7, p. 6-pg., 2022-04-26. |
| Resumo | |
The parton distribution of the pion is obtained for the first time from the solution of a dynamical equation in Minkowski space. The adopted equation is the homogeneous Bethe-Salpeter one with a ladder kernel, described in terms of (i) constituent quarks and gluons degrees of freedom, and (ii) an extended quark gluon vertex. The masses of quark and gluon as well as the interaction-vertex scale have been chosen in a range suggested by lattice QCD calculations, and calibrated to reproduce both pion mass and decay constant. In addition to the full parton distribution, we have also calculated the contribution from the light front valence wave function, corresponding to the lowest Fock component in the expansion of the pion state. After applying an evolution with an effective charge and a LO splitting function, a detailed and inspiring comparison with both the extracted experimental data (with and without resummation effects) and other recent calculations obtained in different frameworks is presented. Interestingly, in a wide region of longitudinal-momentum fraction, the parton distribution function receives sizable contributions from the higher Fock-components of the pion state at the initial scale, while approaching the tail the light-front valence component dominates, as expected. Moreover, an exponent ???3 is found suitable for describing the tail at the scale 5.2 GeV. (AU) | |
| Processo FAPESP: | 18/21758-2 - Problemas relativisticos de poucos corpos e reações com antiprotons |
| Beneficiário: | Emanuel Arthur Ydrefors |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| 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 |
| Processo FAPESP: | 19/07767-1 - Reações nucleares com núcleos fracamente ligados ou com estrutura de cluster, radioativos e estáveis |
| Beneficiário: | Leandro Romero Gasques |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 17/05660-0 - Estudos teóricos da estrutura e reações de núcleos exóticos e sistemas de muitos corpos |
| Beneficiário: | Brett Vern Carlson |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |