Dec 2 – 6, 2024
Europe/Zurich timezone

Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee

Dec 3, 2024, 4:45 PM
15m
Urška 1 (Exhibition and Convention center)

Urška 1

Exhibition and Convention center

Dunajska cesta 18, 1000 Ljubljana, Slovenia
Parallel Session Talk Parallel track Collider 1

Speaker

Patrick Bolton (Jožef Stefan Institute)

Description

We examine the prospect of probing extensions of the Standard Model (SM) involving heavy neutral leptons (HNLs) at FCC-ee. Using the effective field theory (EFT) approach, we determine the impact of new interactions on the production and decay of HNLs at FCC-ee. In particular, we consider EFT operators which induce vector, scalar and tensor four-fermion interactions and effective charged- and neutral-current interactions of HNLs, which may also mix with the active neutrinos of the SM. We first consider constraints on the active-sterile mixing and EFT Wilson coefficients from monophoton searches. We then investigate the constraints from displaced vertex decay signatures. In both analyses, we consider the scenarios where the HNLs are Dirac or Majorana fermions.

Author

Patrick Bolton (Jožef Stefan Institute)

Presentation materials