Probing Scotogenic Effects in e+e- Colliders

摘要

We explore the possibility of employing e+e- colliders to probe thescotogenic model, in which neutrinos get mass radiatively via one-loopinteractions involving dark matter. Assuming the lightest one of the newparticles in the model to be fermionic cold dark matter and taking into accountvarious constraints, including those from LHC Higgs experiments, we show thatLEP II data on e+e- scattering into a pair of charged leptons plus missingenergy can place significant extra restrictions on the parameter spacecontaining sufficiently low masses of the charged scalars in the model. On theother hand, LEP II data on e+e- collisions into a photon plus missing energy donot yield strong constraints. The allowed parameter space can still accommodateHiggs exotic decays into the nonstandard particles and thus is testable at theLHC. We also consider using future measurements of these two types of e+e-scattering at the International Linear Collider to examine the scenario ofinterest further and find that they can provide complementary information aboutit, whether or not they reveal scotogenic effects.