Volume 481 - 9th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE2024) - Collider 1
Exploring the $\nu$SMEFT with Missing Energy and Displaced Vertex Signatures at FCC-ee
P. Bolton*, F.F. Deppisch, S. Kulkarni, C. Majumdar and W. Pei
*: corresponding author
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Published on: April 10, 2025
Abstract
We study the potential of FCC-ee to probe GeV-scale heavy neutral leptons (HNLs) in Standard Model extensions using the effective field theory (EFT) approach. Focusing on $\nu$SMEFT operators at dimension $d \leq 7$, we study their impact on HNL production and decay at an $e^+e^-$ collider. For Majorana and Dirac HNLs, sensitivities to the active-sterile mixing and EFT Wilson coefficients are evaluated for monophoton searches and displaced vertex signatures at FCC-ee. Constraints on Wilson coefficients are translated into lower bounds on the new physics scale.
DOI: https://doi.org/10.22323/1.481.0006
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