| Full text | |
| Author(s): |
de Paula, Wayne
[1]
;
Frederico, Tobias
[1]
;
Salme, Giovanni
[2]
;
Viviani, Michele
[3]
;
Pimentel, Rafael
[1]
Total Authors: 5
|
| Affiliation: | [1] DCTA, Dept Fis, Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Ist Nazl Fis Nucl, Sez Roma, Ple A Moro 2, I-00185 Rome - Italy
[3] Ist Nazl Fis Nucl, Sez Pisa, Largo Pontecorvo 3, I-56100 Pisa - Italy
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | EUROPEAN PHYSICAL JOURNAL C; v. 77, n. 11 NOV 14 2017. |
| Web of Science Citations: | 5 |
| Abstract | |
The Bethe-Salpeter equation for two-body bound system with spin 1/2 constituent is addressed directly in the Minkowski space. In order to accomplish this aim we use the Nakanishi integral representation of the Bethe-Salpeter amplitude and exploit the formal tool represented by the exact projection onto the null-plane. This formal step allows one (i) to deal with end-point singularities one meets and (ii) to find stable results, up to strongly relativistic regimes, which settle in strongly bound systems. We apply this technique to obtain the numerical dependence of the binding energies upon the coupling constants and the light-front amplitudes for a fermion-fermion 0(+) state with interaction kernels, in ladder approximation, corresponding to scalar-, pseudoscalarand vector-boson exchanges, respectively. After completing the numerical survey of the previous cases, we extend our approach to a quark-antiquark system in 0(-) state, taking both constituent-fermion and exchanged-boson masses, from lattice calculations. Interestingly, the calculated light-front amplitudes for such a mock pion show peculiar signatures of the spin degrees of freedom. (AU) | |
| FAPESP's process: | 13/26258-4 - Superdense matter in the universe |
| Grantee: | Manuel Máximo Bastos Malheiro de Oliveira |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/05660-0 - Theoretical studies of the structure and reactions of exotic nuclei and many-body systems |
| Grantee: | Brett Vern Carlson |
| Support Opportunities: | Research Projects - Thematic Grants |