Estia Eichten, Kenneth Lane, Adam Martin
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 $\sigma B(gg \to \eta_T \to \gamma\gamma)$ to agree with the observed two-photon rate, but $\eta_T \to ZZ^*, WW^* \to$ 4 leptons are greatly suppressed relative to the standard-model Higgs rates. We therefore predict that the present $X \to ZZ^*, WW^*$ signals will be understood as backgrounds when more data is analyzed. This is a crucial and immediate test of our proposal. In our model the $\eta_T$ mixes almost completely with the isovector $\pi^0_T$, giving two similar states, $\eta_L$ at 125 GeV and $\eta_H$ higher, possibly in the range 170--190 GeV. Other important consequences of this mixing are (1) the only associated production of $\eta_L$ is via $\rho_T \to W \eta_L$, and this could be sizeable; (2) $\eta_H$ may soon be accessible in $gg \to \eta_H \to \gamma\gamma$; and (3) LSTC phenomenology at the LHC is substantially modified.
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http://arxiv.org/abs/1210.5462
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