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Statut |
Confirmé |
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Série |
NUC-THEO |
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Domaines |
nucl-th |
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Date |
Mercredi 29 Novembre 2017 |
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Heure |
11:30 |
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Institut |
IPN |
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Salle |
Bâtiment 100, Salle A015 |
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Nom de l'orateur |
Karmanov |
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Prenom de l'orateur |
V. A. |
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Addresse email de l'orateur |
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Institution de l'orateur |
Lebedev Physical Institute, Moscow, Russia |
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Titre |
Wave functions and EM form factors via Bethe-Salpeter-Nakanishi approach |
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Résumé |
New results on calculation of the Bethe-Salpeter (BS) amplitude in the
Minkowski space, proceeding from the Euclidean BS amplitude, will be pre-
sented. The instability of the continuation Euclidean -> Minkowski ampli-
tude is strongly suppressed (though, not completely) by using the Nakanishi
integral representation and Tikhonov regularization. The residual uncer-
tainty almost does not make any influence on the observables (electromag-
netic form factors).
For the analytically known interaction kernel we derive an integral equa-
tion for the Nakanishi function. The latter is found when, in addition to
ladder, the cross graphs are incorporated. Then, with this solution, the elec-
tromagnetic form factors are calculated beyond the impulse approximation,
taking into account also the cross graphs in the electromagnetic vertex.
The three-body BS equation with the contact interaction is solved for
the first time. We compare the BS results with ones found previously in the
framework of the light front dynamics. |
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Numéro de preprint arXiv |
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Commentaires |
$ $ |
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Fichiers attachés |
- 2017_11_29_V_Karmanov.pdf (215100 bytes)
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