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Realizing dark matter and Higgs inflation in light of LHC diphoton excess. (English) Zbl 1360.81330

Summary: LHC Run-2 has provided intriguing di-photon signals of a new resonance around 750 GeV, 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 \(\chi\) providing a natural dark matter (DM) candidate. The real component of \(\mathcal{S}\) serves as the new resonance (750 GeV) 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 cosmological observations. We construct two representative samples A and B of our model for demonstration. We study the mono-jet signals of DM production from invisible decays \(\text{Re}(\mathcal{S}) \to \chi \chi\) at the LHC Run-2. We further derive the DM relic density bound, and analyze constraints from the direct and indirect DM detections.

MSC:

81V25 Other elementary particle theory in quantum theory
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