  The recent ATLAS and CMS experiments show the first observations of a new
particle in the search for the Standard Model Higgs boson at the LHC. We
revisit the theoretical inconsistency of the fundamental high-energy cutoff
with the parity-violating gauge symmetry of local quantum field theory for the
standard model. This inconsistency suggests high-dimensional operators of
fermion interactions, which are attributed to the quantum gravity. In this
letter, recalling the minimal dynamical symmetry-breaking mechanism, we show
that it is energetically favorable for the top quark to acquire its mass via
spontaneous symmetry breaking, whereas other fermions acquire their masses via
explicit symmetry breaking.
