A Higgs Impostor in Low-Scale Technicolor

Abstract

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 $X\to Z{Z}^{\ast }\to 4\ell$. In our model the ${\eta }_T$ 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 $\to \to W{\eta }_L$, and this could be sizable; (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.

25 pages, 9 figures, references added. Our discussion of the 125 GeV boson discovered at CERN is updated to include the latest ATLAS and CMS data. We critically examine the crucial ZZ* -> 4l data and argue that it does not justify identifying this boson as a Higgs. In addition, several minor corrections have been made

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Cited by in corpus (1)

• Quarkonium Resonance Model of the 125 GeV Boson