dorsal/arxiv
View SchemaTwo-pion exchange and strong form-factors in covariant field theories
| Authors | G. Ramalho, A. Arriaga, M. T. Peña |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9808060 |
| URL | https://arxiv.org/abs/nucl-th/9808060 |
| DOI | 10.1103/PhysRevC.60.047001 |
| Journal | Phys.Rev. C60 (1999) 047001 |
Abstract
In this work improvements to the application of the Gross equation to nuclear systems are tested. In particular we evaluate the two pion exchange diagrams, including the crossed-box diagram, using models developed within the spectator-on-mass-shell covariant formalism. We found that the form factors used in these models induce spurious contributions that violate the unitary cut requirement. We tested then some alternative form-factors in order to preserve the unitarity condition. With this new choice, the difference between the exact and the spectator-on-mass-shell amplitudes is of the order of the one boson scalar exchange, supporting the idea that this difference may be parameterized by this type of terms.
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"abstract": "In this work improvements to the application of the Gross equation to nuclear\nsystems are tested. In particular we evaluate the two pion exchange diagrams,\nincluding the crossed-box diagram, using models developed within the\nspectator-on-mass-shell covariant formalism. We found that the form factors\nused in these models induce spurious contributions that violate the unitary cut\nrequirement. We tested then some alternative form-factors in order to preserve\nthe unitarity condition. With this new choice, the difference between the exact\nand the spectator-on-mass-shell amplitudes is of the order of the one boson\nscalar exchange, supporting the idea that this difference may be parameterized\nby this type of terms.",
"arxiv_id": "nucl-th/9808060",
"authors": [
"G. Ramalho",
"A. Arriaga",
"M. T. Pe\u00f1a"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.60.047001",
"journal_ref": "Phys.Rev. C60 (1999) 047001",
"title": "Two-pion exchange and strong form-factors in covariant field theories",
"url": "https://arxiv.org/abs/nucl-th/9808060"
},
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