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arXiv · 1602.01801

Realizing Dark Matter and Higgs Inflation in Light of LHC Diphoton Excess

Shao-Feng Ge·Hong-Jian He·Jing Ren·Zhong-Zhi Xianyu
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Abstract

LHC Run-2 has provided intriguing di-photon signals of a new resonance around 750GeV, which, if not due to statistical fluctuations, must call for new physics beyond the standard model (SM) at TeV scale. We propose a minimal extension of the SM with a complex singlet scalar $\mathcal{S}$ and a doublet of vector-like quarks. The scalar sector respects CP symmetry, with its CP-odd imaginary component $χ$ providing a natural dark matter (DM) candidate. The real component of $\mathcal{S}$ serves as the new resonance (750GeV) and explains the diphoton excess of the LHC Run-2. The new scalar degrees of freedom of $\mathcal{S}$ help to stabilize the Higgs vacuum, and can realize the Higgs inflation around GUT scale, consistent with the current cosmology observations. We construct two representative samples A and B of our model for demonstration. We study the mono-jet signals of the DM production from invisible decays Re$(\mathcal{S}) \to χχ$ at the LHC Run-2. We further derive the DM relic density bound, and analyze the constraints from direct and indirect DM detections.

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Shao-Feng Ge, Hong-Jian He, Jing Ren, Zhong-Zhi Xianyu. 2016-04-05. Realizing Dark Matter and Higgs Inflation in Light of LHC Diphoton Excess. https://doi.org/10.1016/j.physletb.2016.04.008

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