(1) Presentation(s)
Jeu. 06/04/2017 14:00 Grande Ourse, Bâtiment 13, Etage 1 QUEVILLON Jérémie (King's College London) The Fermi Theory of the 21st Century (Théorie des Interactions Fondamentales) If the Physics Beyond the Standard Model (BSM) is decoupled at higher energies, the Standard Model as an effective field theory (SM EFT) is a pertinent framework for phenomenology. The BSM effects on observables are parametrized by the Wilson coefficients of dimension-6 operators, and bounds on their values can be placed from experimental measurements. Integrating out heavy particles at one-loop to obtain expressions for the Wilson coefficients is now also simplified by the use of our universal one-loop effective action. We show how the one-loop effective action obtained from the path integral Covariant Derivative Expansion method can be written in a universal closed form. This result has general applicability beyond the SM EFT and can be used for integrating out any UV theory to obtain a low-energy EFT. We illustrate the relationship of our results to the Standard Model EFT, using as an example the supersymmetric stop and sbottom squark Lagrangian and extracting from our universal expression the Wilson coefficients of dimension-six operators composed of SM fields. Pour plus d'informations, merci de contacter Desai N. |