Towards the one-loop SMEFT IR/UV dictionary

May 3, 2023
3:00pm to 4:00pm

IFT Seminar Room/Red Room

Theoretical Physics, general interest
Guilherme Guedes

IFT Seminar Room/Red Room


The Standard Model Effective Field Theory (SMEFT) parametrizes the effects on heavy new physics in terms of generic non-renormalizable interactions, allowing for a study of new physics contributions to low-energy observables in a model-independent way. When connecting theory with experiment in a systematic way, dictionaries which relate the effective coefficients with the complete list of possible UV physics which generate them (and their explicit contribution) are important to make sure no scenario is ignored.

In this talk, I will report on the first step towards the calculation of the complete one-loop, dimension 6 IR/UV dictionary in the SMEFT. We will start by exploring the efforts in explaining the anomalous magnetic moment of the muon (which gets the leading contribution at one-loop level in the SMEFT) and how a complete dictionary can be helpful to avoid missing any interesting UV scenarios. We will then go over how to build the full dictionary for the remaining operators ending up with a complete classification of renormalizable extensions of the Standard Model with new scalar and fermion fields that contribute to these operators at one-loop order, together with their explicit contribution. Finally we will show how to use this dictionary to explore the possible UV scenarios responsible for a recently reported tension in non-leptonic B-decays.

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