  The walking technicolor based on the ladder Schwinger-Dyson gap equation is
studied, with the scale-invariant coupling being an idealization of the
Caswell-Banks-Zaks infrared fixed point in the "anti-Veneziano limit", such
that $N_C \rightarrow \infty$ with $N_C \cdot \alpha(\mu^2)=$ fixed and
$N_F/N_C=$ fixed ($\gg 1$), of the $SU(N_C)$ gauge theory with massless $N_F$
flavors near criticality. We show that the 125 GeV Higgs can be naturally
identified with the technidilaton (TD) predicted in the walking technicolor, a
pseudo Nambu-Goldstone (NG) boson of the spontaneous symmetry breaking of the
approximate scale symmetry. Ladder calculations yield the TD mass $M_\phi$ from
the trace anomaly as $M_\phi^2 F_\phi^2= -4 \langle \theta_\mu^\mu \rangle = -
\frac{\beta(\alpha (\mu^2))}{\alpha(\mu^2)}\, \langle G_{\lambda
\nu}^2(\mu^2)\rangle \simeq N_C N_F\frac{16}{\pi^4} m_F^4$, independently of
the renormalization point $\mu$, where $m_F$ is the dynamical mass of the
technifermion, and $F_\phi={\cal O} (\sqrt{N_F N_C}\, m_F)$ the TD decay
constant. It reads $M_\phi^2\simeq (\frac{v_{\rm EW}}{2} \cdot \frac{5 v_{\rm
EW}}{F_\phi})^2 \cdot [\frac{8}{N_F}\frac{4}{N_C}]$, ($v_{\rm EW}=246$ GeV),
which implies $F_\phi\simeq 5 \,v_{\rm EW} $ for $M_\phi \simeq 125\, {\rm
GeV}\simeq \frac{1}{2} v_{\rm EW}$ in the one-family model ($N_C=4, N_F=8$), in
good agreement with the current LHC Higgs data. The result reflects a generic
scaling $ M_\phi^2/v_{\rm EW}^2\sim M_\phi^2/F_\phi^2 \sim m_F^2 /F_\phi^2 \sim
1/(N_F N_C) \rightarrow 0 $ as a vanishing trace anomaly, namely the TD has a
mass vanishing in the anti-Veneziano limit, similarly to $\eta^\prime$ meson as
a pseudo-NG boson of the ordinary QCD with vanishing $U(1)_A$ anomaly in the
Veneziano limit ($N_F/N_C \ll 1$).
