Centro de Excelencia Severo Ochoa

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Distinguishing models with $\mu\to e$ observables

Seminar

Specialist level

Speaker:

Marco Ardu

Institution:

IFIC, Universitat de València

Location&Place:

IFT Seminar Room/Red Room

Abstract:

Neutrino masses and oscillations demonstrate that lepton flavour violation is new physics that must exist, but it is yet to be observed in processes involving charged leptons. Upcoming experiments will improve the branching ratio sensitivity by orders of magnitude for a handful of $\mu\to e$ transitions ($\mu\to e \gamma,\ \mu\to 3e,\ \mu A\to eA$), and could observe lepton flavour-changing contact interactions for the first time. In this talk, I will show that future $\mu\to e$ data can be parametrised in a bottom-up effective field theory by twelve Wilson coefficients, which can in principle all be determined by upcoming experimental measurements. Using the fact that, in this 12-dimensional coefficient space, popular TeV-scale models (such as the type-II and inverse seesaws) can predict points only in specific subspaces, I show that $\mu\to e$ experiments have the ability to rule them out.