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The power of Effective Field Theory : Deriving the Electroweak Standard Model
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 theleading 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.
Ulf-G. Meissner
Universität Bonn & Forschungszentrum Jülich
16/05/2019 à 11:00
IPN Orsay, salle A015, bâtiment 100

Notes de dernières minutes :

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Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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