Lepton flavour violation signal of the singly charged scalar singlet at the ILC

The singly charged SU(2)L singlet scalar is one of the very interesting new particles, as it can generate neutrino masses at loop level, produce contributions to various flavour observables. We study the possibility of detecting this kind of scalar predicted by the singly-charged scalar model at ILC via the lepton flavour violation (LFV) process e⁺e⁻→ S⁺S⁻→ μ e + E-10.5 mu/. Considering the constraints on the free parameters, we obtain the expected sensitivities of the ILC with the center of mass energy √s=1~TeV and the integrated luminosity L= 1.5~ab⁻¹ to the parameter space of the singly-charged scalar model. The prospective excluded mass range at $95%$ C.L. is MS 470~GeV, 410~GeV for the branching ratio Bμ e = $100%$ , $50%$, respectively, while the scalar with MS 300~GeV is excluded at $95%$ C.L. for Bμ e = $30%$.