| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | de Melo, JPBC | |
| dc.creator | Frederico, T. | |
| dc.creator | Pace, E. | |
| dc.creator | Salme, G. | |
| dc.date | 2014-05-20T14:06:35Z | |
| dc.date | 2016-10-25T17:11:52Z | |
| dc.date | 2014-05-20T14:06:35Z | |
| dc.date | 2016-10-25T17:11:52Z | |
| dc.date | 2002-09-09 | |
| dc.date.accessioned | 2017-04-05T21:38:27Z | |
| dc.date.available | 2017-04-05T21:38:27Z | |
| dc.identifier | Nuclear Physics A. Amsterdam: Elsevier B.V., v. 707, n. 3-4, p. 399-424, 2002. | |
| dc.identifier | 0375-9474 | |
| dc.identifier | http://hdl.handle.net/11449/23375 | |
| dc.identifier | http://acervodigital.unesp.br/handle/11449/23375 | |
| dc.identifier | 10.1016/S0375-9474(02)00990-9 | |
| dc.identifier | WOS:000177698100007 | |
| dc.identifier | http://dx.doi.org/10.1016/S0375-9474(02)00990-9 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/868547 | |
| dc.description | The frame and scale dependence of the pair-term contribution to the electromagnetic form factor of a spin-zero composite system of two-fermions is studied within the Light Front. The form factor is evaluated from the plus-component of the current in the Breit frame, using for the first time a nonconstant, symmetric ansatz for the Bethe-Salpeter amplitude. The frame dependence is analyzed by allowing a nonvanishing plus component of the momentum transfer, while the dynamical scale is set by the masses of the constituents and by mass and size of the composite system. A transverse momentum distribution, associated with the Bethe-Salpeter amplitude, is introduced which allows to define strongly and weakly relativistic systems. In particular, for strongly relativistic systems, the pair term vanishes for the Drell-Yan condition, while is dominant for momentum transfer along the light-front direction. For a weakly relativistic system, fitted to the deuteron scale, the pair term is negligible up to momentum transfers of 1 (GeV/c)(2). A comparison with results obtained within the Front-Form Hamiltonian dynamics with a fixed number of constituents is also presented. (C) 2002 Elsevier B.V. B.V. All rights reserved. | |
| dc.language | eng | |
| dc.publisher | Elsevier B.V. | |
| dc.relation | Nuclear Physics A | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.title | Pair term in the electromagnetic current within the Front-Form dynamics: spin-0 case | |
| dc.type | Otro | |
