PT Journal
AU Barducci, D
   Bertuzzo, E
   Caputo, A
   Hernandez, P
   Mele, B
TI The see-saw portal at future Higgs Factories
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2021
BP 117
EP 32pp
VL 03
IS 3
DI 10.1007/JHEP03(2021)117
LA English
DE Beyond Standard Model; Higgs Physics; Neutrino Physics
AB We consider an extension of the Standard Model with two right-handed singlet fermions with mass at the electroweak scale that induce neutrino masses, plus a generic new physics sector at a higher scale Lambda. We focus on the effective operators of lowest dimension d = 5, which induce new production and decay modes for the singlet fermions. We assess the sensitivity of future Higgs Factories, such as FCC-ee, CLIC-380, ILC and CEPC, to the coefficients of these operators for various center of mass energies. We show that future lepton colliders can test the cut-off of the theory up to Lambda similar or equal to 500-1000 TeV, surpassing the reach of future indirect measurements of the Higgs and Z boson widths. We also comment on the possibility of determining the underlying model flavor structure should a New Physics signal be observed, and on the impact of higher dimensional d = 6 operators on the experimental signatures.
ER