Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série IPN-X
Domaines hep-ph
Date Jeudi 16 Mai 2019
Heure 11:00
Institut IPN
Salle Salle A015
Nom de l'orateur Meissner
Prenom de l'orateur Ulf G.
Addresse email de l'orateur
Institution de l'orateur Universität Bonn & Forschungszentrum Jülich
Titre The power of Effective Field Theory: Deriving the electroweak Standard Model
Résumé In this talk, I revisit the problem of deriving local gauge invariance with spontaneous symmetry breaking in the context of an Effective Field Theory (EFT). Previous derivations were based on the condition of tree-order unitarity. However, the modern point of view considers the Standard Model as the leading order approximation to an EFT. As tree-order unitarity is in any case violated by higher-order terms in an effective field theory, it is instructive to investigate a formalism which can be also applied to analyze higher-order interactions. For that, I consider an effective field theory of massive vector bosons interacting with a massive scalar field. Imposing a number of physical conditions and requiring perturbative renormalizability as well as scale separation lets one recover the gauge-invariant Lagrangian with spontaneous symmetry breaking taken in the unitary gauge as the leading order approximation to an EFT. The implementation of electromagnetism is also touched upon. Finally, I outline the additional work that is required to finish this program.
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