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Hints for a non-standard Higgs boson from the LHC

Martti Raidal, Alessandro Strumia

TL;DR

The paper reexamines Higgs boson decays into Dark Matter in light of LHC Higgs searches, noting hints from CMS and ATLAS that favor a non-standard Higgs with about 50% invisible branching ratio and a mass near 143 GeV. It shows that such a scenario can be realized in the simplest scalar singlet Dark Matter model, which fixes the DM mass around 50 GeV and predicts a DM-nucleon cross section just below current direct-detection bounds. The authors argue that Xenon100 and ongoing LHC data can test this possibility, offering a coherent link between collider signals and DM phenomenology via the Higgs portal coupling. If realized, this framework links invisible Higgs decays to DM relic density and direct detection, providing a concrete target for near-term experiments.

Abstract

We reconsider Higgs boson invisible decays into Dark Matter in the light of recent Higgs searches at the LHC. Present hints in the CMS and ATLAS data favor a non-standard Higgs boson with approximately 50% invisible branching ratio, and mass around 143 GeV. This situation can be realized within the simplest thermal scalar singlet Dark Matter model, predicting a Dark Matter mass around 50 GeV and direct detection cross section just below present bound. The present runs of the Xenon100 and LHC experiments can test this possibility.

Hints for a non-standard Higgs boson from the LHC

TL;DR

The paper reexamines Higgs boson decays into Dark Matter in light of LHC Higgs searches, noting hints from CMS and ATLAS that favor a non-standard Higgs with about 50% invisible branching ratio and a mass near 143 GeV. It shows that such a scenario can be realized in the simplest scalar singlet Dark Matter model, which fixes the DM mass around 50 GeV and predicts a DM-nucleon cross section just below current direct-detection bounds. The authors argue that Xenon100 and ongoing LHC data can test this possibility, offering a coherent link between collider signals and DM phenomenology via the Higgs portal coupling. If realized, this framework links invisible Higgs decays to DM relic density and direct detection, providing a concrete target for near-term experiments.

Abstract

We reconsider Higgs boson invisible decays into Dark Matter in the light of recent Higgs searches at the LHC. Present hints in the CMS and ATLAS data favor a non-standard Higgs boson with approximately 50% invisible branching ratio, and mass around 143 GeV. This situation can be realized within the simplest thermal scalar singlet Dark Matter model, predicting a Dark Matter mass around 50 GeV and direct detection cross section just below present bound. The present runs of the Xenon100 and LHC experiments can test this possibility.

Paper Structure

This paper contains 1 section, 5 equations, 2 figures.

Table of Contents

  1. Acknowledgements

Figures (2)

  • Figure 1: Hints in CMS and ATLAS data for a Higgs boson with mass around 143 GeV. The figure is obtained converting into a $\chi^2$ the experimental fits reported in terms of probability values in Refs. CMSLPATLASLP.
  • Figure 2: Left: Iso-lines of the invisible Higgs boson BR in the scalar DM singlet model, fixing the Higgs/DM coupling from the cosmological DM abundance. The green region shows the region favored at $68\%$ and $95\%$ C.L. from our estimate of LHC data, ignoring look-elsewhere-effects. The red region is excluded by Xenon100, and the magenta region is excluded by LHC (upper) and LEP (lower) higgs searches. The gray line corresponds to the most minimal model with $m^2=0$. Right: Predicted DM spin independent direct detection cross section as a function of the DM mass (green region).