  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 scenario that high-dimensional operators of fermions must be
present due to the theoretical inconsistency of the fundamental cutoff (quantum
gravity) with the parity-violating gauge symmetry of the Standard Model.
Studying the four-fermion interaction of the third quark family, we show that
at an intermediate energy threshold E\approx 4.27 TeV for the four-fermion
coupling being larger than a critical value, the spontaneous symmetry-breaking
phase transits to the strong-coupling symmetric phase where composite Dirac
fermions form fully preserving the chiral gauge symmetry of the Standard Model
and the parity-symmetry is restored. Under this circumstance, we perform the
standard analysis of renormalization-group equations of the Standard Model in
the spontaneous symmetry-breaking phase. As a result, the Higgs boson mass
m_H\approx 126.7 GeV and top-quark mass m_t\approx 172.7 GeV are obtained
without drastically fine-tuning the four-fermion coupling.
