PT Journal
AU Fernandez-Martinez, E
   Gonzalez-Lopez, M
   Hernandez-Garcia, J
   Hostert, M
   Lopez-Pavon, J
TI Effective portals to heavy neutral leptons
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2023
BP 001
EP 45pp
VL 09
IS 9
DI 10.1007/JHEP09(2023)001
LA English
DE Neutrino Interactions; Non-Standard Neutrino Properties; Sterile or Heavy Neutrinos
AB The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is strongly motivated by the observation of neutrino masses and mixing. The mass of these new particles could lie below the electroweak scale, making them accessible to lowenergy laboratory experiments. Additional new physics at high energies can mediate new interactions between the Standard Model particles and HNLs, and is most conveniently parametrized by the neutrino Standard Model Effective Field Theory, or nu SMEFT for short. In this work, we consider the dimension six nu SMEFT operators involving one HNL field in the mass range of O(1) MeV < MN < O(100) GeV. By recasting existing experimental limits on the production and decay of new light particles, we constrain the Wilson coefficients and new physics scale of each operator as a function of the HNL mass.
ER