Shedding light on new physics with Effective Field Theories

Speaker: 
Ilaria Brivio (NBI)
Event Type: 
Seminar
Location: 
Room U2-8A (Physics Dept., Bicocca U.)

Effective Field Theories (EFTs) are a powerful tool for investigating the presence of new physics beyond the Standard Model. We will first consider the Standard Model Effective Field Theory and discuss, in a “bottom-up” approach, how its parameters can be constrained with global fit analyses minimising assumptions on the UV physics. As a case study I will present the results of a fit to electroweak data. The latter exhibits instructive features, among which the presence of two unconstrained combinations of Wilson coefficients whose origin can be understood in terms of a reparameterisation invariance. The second part of the talk will follow a “top-down” perspective: EFT techniques will be employed to take an alternative approach to the hierarchy problem, in which the Higgs mass is not stabilised around the TeV scale, but rather determined by radiative corrections at higher energies. In particular I will discuss the possibility that the Higgs potential is radiatively generated within a type-I seesaw model for neutrino masses.

Contact address

Dipartimento di Fisica
Università degli Studi di Milano
Via Celoria, 16 I-20133 Milano (Italy)
Tel. +39 02 503 17279 - Fax. 17480

Unimi

INFN Milano