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arXiv · 1705.08433

Higgs-photon resonances

Bogdan A. Dobrescu·Patrick J. Fox·John Kearney
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Abstract

We study models that produce a Higgs boson plus photon ($h^0 γ$) resonance at the LHC. When the resonance is a $Z'$ boson, decays to $h^0 γ$ occur at one loop. If the $Z'$ boson couples at tree-level to quarks, then the $h^0 γ$ branching fraction is typically of order $10^{-5}$ or smaller. Nevertheless, there are models that would allow the observation of $Z' \to h^0 γ$ at $\sqrt{s} = 13$ TeV with a cross section times branching fraction larger than 1 fb for a $Z'$ mass in the 200--450 GeV range, and larger than 0.1 fb for a mass up to 800 GeV. The 1-loop decay of the $Z'$ into lepton pairs competes with $h^0 γ$, even if the $Z'$ couplings to leptons vanish at tree level. We also present a model in which a $Z'$ boson decays into a Higgs boson and a pair of collimated photons, mimicking an $h^0 γ$ resonance. In this model, the $h^0 γ$ resonance search would be the discovery mode for a $Z'$ as heavy as 2 TeV. When the resonance is a scalar, although decay to $h^0 γ$ is forbidden by angular momentum conservation, the $h^0$ plus collimated photons channel is allowed. We comment on prospects of observing an $h^0 γ$ resonance through different Higgs decays, on constraints from related searches, and on models where $h^0$ is replaced by a nonstandard Higgs boson.

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Bogdan A. Dobrescu, Patrick J. Fox, John Kearney. 2017-05-23. Higgs-photon resonances. https://doi.org/10.1140/epjc%2Fs10052-017-5276-9

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