A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess

Abstract

Due to the strong constrain from the LUX experiment, the scalar portal dark matter can not generally explain a gamma-ray excess in the galactic center by the annihilation of dark matter into $b\bar{b}$. With the motivation of eliminating the tension, we add a scalar dark matter to the aligned two-Higgs-doublet model, and focus on a simplified scenario, which has two main characteristics: (i) The heavy CP-even Higgs is the discovered 125 GeV Higgs boson, which has the same couplings to the gauge bosons and fermions as the SM Higgs. (ii) Only the light CP-even Higgs mediates the dark matter interactions with SM particles, which has no couplings to $WW$ and $ZZ$, but the independent couplings to the up-type quarks, down-type quarks and charged leptons. We find that the tension between $<\sigma v{>}_{SS\to b\bar{b}}$ and the constraint from LUX induced by the scalar portal dark matter can go away for the isospin-violating dark matter-nucleon coupling with $-1.0<f^n/f^p<0.7$, and the constraints from the Higgs search experiments and the relic density of Planck are also satisfied.

12 pages, 3 figures, 1 table; reference added

References in corpus (5)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Dark Matter Results from 225 Live Days of XENON100 Data
• A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
• Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes

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• NMSSM Interpretation of the Galactic Center Excess
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• Galactic center $\gamma$-ray excess in hidden sector DM models with dark gauge symmetries: local $Z_3$ symmetry as an example
• Search for Gamma-ray Emission from Dark Matter Annihilation in the Large Magellanic Cloud with the Fermi Large Area Telescope
• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• Towards a Supersymmetric Description of the Fermi Galactic Center Excess
• New LUX and PandaX-II Results Illuminating the Simplest Higgs-Portal Dark Matter Models
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• $SU(2{)}_X$ Vector DM and Galactic Center Gamma-Ray Excess
• Two-Higgs-doublet models in light of current experiments: a brief review
• Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a $U(1)$ symmetry
• Real singlet scalar dark matter extension of the Georgi-Machacek model
• Gauge-independent Renormalization of the N2HDM
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Wrong sign Yukawa coupling of the 2HDM plus a singlet scalar dark matter confronted with dark matter and Higgs data
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Missing particle associated with two bottom quarks at the LHC: Mono-$b$ versus 2$b$ with razor variables
• Phenomenology of the dark matter sector in the 2HDM extended with complex scalar singlet
• Dark matter properties implied by gamma ray interstellar emission models