  Assuming that no other conventional new physics is found immediately at the
LHC, we investigate how just the consistent solution of the scalar mass
hierarchy problem points towards the minimal necessary field content. We show
that to ameliorate the fine-tuning problem, one needs to introduce more scalar
degrees of freedom. The simplest solution is one or more real singlets (with
the possibility of combining two of them in a complex singlet), which may act
as viable cold dark matter candidates, because the constraints on the scalar
potential disfavor any mixing between the new scalar(s) with the SM doublet.
Furthermore, the fine-tuning problem of the new scalars necessitates the
introduction of vector-like fermions. Thus, singlet scalar(s) and vector
fermions are minimal enhancements over the Standard Model to alleviate the
fine-tuning problem. We also show that the model predicts Landau poles for all
the scalar couplings, whose positions depend only on the number of such
singlets. Thus, introduction of some new physics at that scale becomes
inevitable. We also discuss how the model confronts the LHC constraints and the
latest XENON100 data.
