hep-ph

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# Title: Dark-Photon searches via Higgs-boson production at the LHC

Abstract: Dark photons $\bar \gamma$ mediating long-range forces in a dark sector are predicted by various new physics scenarios, and are being intensively searched for in experiments. We extend a previous study of a new discovery process for dark photons proceedings via Higgs-boson production at the LHC. Thanks to the non-decoupling properties of the Higgs boson, BR($H\to \gamma\bar \gamma$) values up to a few percent are possible for a massless dark photon, even for heavy dark-sector scenarios. The corresponding signature consists (for a Higgs boson at rest) of a striking monochromatic photon with energy $E_{\gamma}= m_H/2$, and similar amount of missing energy. We perform a model independent analysis at the LHC of both the gluon-fusion and VBF Higgs production mechanisms at 14 TeV, including parton-shower effects, and updating our previous parton-level analysis at 8 TeV in the gluon-fusion channel by a more realistic background modeling. We find that a $5\sigma$ sensitivity can be reached in the gluon-fusion channel for BR($H\to \gamma\bar \gamma)\simeq\,$0.1% with an integrated luminosity of $L\simeq 300\, {\rm fb}^{-1}$. The corresponding VBF reach is instead restricted to 1%. Such decay rates can be naturally obtained in dark-photon scenarios arising from unbroken $U(1)_F$ models explaining the origin and hierarchy of the Yukawa couplings, strongly motivating the search for this exotic Higgs decay at the LHC.
 Comments: 8 pages, 3 figures Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex) Journal reference: Phys. Rev. D 93, 093011 (2016) DOI: 10.1103/PhysRevD.93.093011 Report number: HIP-2016-07/TH Cite as: arXiv:1603.01377 [hep-ph] (or arXiv:1603.01377v1 [hep-ph] for this version)

## Submission history

From: Matti Heikinheimo [view email]
[v1] Fri, 4 Mar 2016 08:42:06 GMT (58kb,D)
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