  The muon-to-electron conversion in nuclei like aluminum, titanium and gold is
studied in the context of a class of mirror fermion model with non-sterile
right-handed neutrinos having mass at the electroweak scale. At the limit of
zero momentum transfer and large mirror lepton masses, we derive a simple
formula to relate the conversion rate with the on-shell radiative decay rate of
muon into electron. Current experimental limits (SINDRUM II) and projected
sensitivities (Mu2e, COMET and PRISM) for the muon-to-electron conversion rates
in various nuclei and latest limit from MEG for the radiative decay rate of
muon into electron are used to put constraints on the parameter space of the
model. Depending on the nuclei targets used in different experiments, for the
mirror lepton mass in the range of 100 to 800 GeV, the sensitivities of the new
Yukawa couplings one can probe in the near future are in the range of one tenth
to one hundred-thousandth, depending on the mixing scenarios in the model.
