Pros and cons of EFTs for new physics

April 15, 2024
3:00pm to 4:30pm

IFT Seminar Room/Red Room

Theoretical Physics, general interest
Speaker: 
Duarte Fontes
Institution: 
Brookhaven Natl. Lab.
Location&Place: 

IFT Seminar Room/Red Room

Abstract: 

Physics beyond the Standard Model (BSM) can be described in a consistent and general way through an Effective Field Theory (EFT). Ultimately, the goal is to associate eventual deviations of the SM with a particular BSM model. In this talk, I discuss the quality of that association, taking the 2 Higgs Doublet Model (2HDM) as BSM model. More specifically, I consider two EFT approaches to it: the Standard Model EFT (SMEFT) and the Higgs EFT (HEFT). In the former, I compare not only different truncations in the SMEFT expansion, but I also ascertain the importance of loop matching. As for the HEFT, I question the assumption according to which the matching is unique. I present three HEFT matchings to the 2HDM, and show that different  ones should be used according to the process and the region of parameter space.