Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines nucl-th
Date Mercredi 29 Novembre 2017
Heure 11:30
Institut IPN
Salle Bâtiment 100, Salle A015
Nom de l'orateur Karmanov
Prenom de l'orateur V. A.
Addresse email de l'orateur
Institution de l'orateur Lebedev Physical Institute, Moscow, Russia
Titre Wave functions and EM form factors via Bethe-Salpeter-Nakanishi approach
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.
Numéro de preprint arXiv
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Fichiers attachés
  • 2017_11_29_V_Karmanov.pdf (215100 bytes) OPEN

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