Bolton, Patrick D;
Deppisch, Frank F;
Kulkarni, Suchita;
Majumdar, Chayan;
Pei, Wenna;
(2025)
Constraining the SMEFT extended with sterile neutrinos at FCC-ee.
Journal of High Energy Physics
, 2025
(10)
, Article 199. 10.1007/JHEP10(2025)199.
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Abstract
We investigate how extensions of the Standard Model (SM) involving heavy neutral leptons (HNLs) can be probed at FCC-ee, the proposed high-energy circular e<sup>+</sup>e<sup>−</sup> collider. 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 d ≤ 7 νSMEFT operators which induce vector, scalar and tensor four-fermion and effective charged- and neutral-current interactions of HNLs, that may also mix with the active neutrinos of the SM. We consider sensitivities to the active-sterile mixing and EFT Wilson coefficients from monophoton searches and displaced vertex decay signatures. In both analyses, we consider the scenarios where HNLs are Majorana or Dirac fermions. We translate the upper bounds on the Wilson coefficients to lower limits on the scale of new physics.
| Type: | Article |
|---|---|
| Title: | Constraining the SMEFT extended with sterile neutrinos at FCC-ee |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP10(2025)199 |
| Publisher version: | https://doi.org/10.1007/JHEP10(2025)199 |
| Language: | English |
| Additional information: | © 2025 Springer Nature. This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, Sterile or Heavy Neutrinos, Neutrino Interactions, SMEFT, FLAVOR VIOLATION, DARK-MATTER, MASS, BARYOGENESIS, DIRAC, NONCONSERVATION, LEPTOGENESIS, MECHANISM, SYMMETRY, PHOTONS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10216903 |
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