A Higgs Impostor in Low-Scale Technicolor

We propose a “Higgs impostor” model for the 125 GeV boson, $X$, recently discovered at the LHC. It is a technipion, ${\eta }_T$, with $I^G J^{PC} = 0^- 0^{-+}$ expected in this mass region in low-scale technicolor. Its coupling to pairs of standard-model gauge bosons are dimension-five operators whose strengths are determined within the model. It is easy for the gluon fusion rate $\sigma B(gg\to {\eta }_T\to \gamma \gamma )$ to agree with the measured one, but ${\eta }_T\to Z{Z}^{\ast },W{W}^{\ast }$ are greatly suppressed relative to the standard-model Higgs rates. This is a crucial test of our proposal. In this regard, we assess the most recent data on $X$ decay modes, with a critical discussion of $X \to ZZ^* \to 4\ell$\mathrm{.}Inourmodelthe$\eta_T$ mixes almost completely with the isovector ${\pi }_T^0$, giving two similar states, ${\eta }_L$ at 125 Gev and ${\eta }_H$ higher, possibly in the range 170–190 Gev. Important consequences of this mixing are (1) the only associated production of et al is via $\to \to W \eta_L$,andthiscouldbesizable;(2)$\eta_H$maysoonbeaccessiblein$gg \to \eta_H \to \gamma\gamma$; and (3) LSTC phenomenology at the LHC is substantially modified.