2HDM Portal Dark Matter: LHC data and the Fermi-LAT 135 GeV Line
Yang Bai, Vernon Barger, Lisa L. Everett, Gabe Shaughnessy
TL;DR
This paper explores a two Higgs doublet model with a scalar dark matter candidate that fits LHC Higgs data and explains the Fermi-LAT 135 GeV gamma-ray line, emphasizing the role of a heavy CP-even Higgs boson.
Contribution
It introduces a specific two Higgs doublet model with scalar dark matter that simultaneously accounts for collider and astrophysical observations, highlighting the importance of the heavy CP-even Higgs boson.
Findings
The heavy CP-even Higgs must have suppressed couplings to gauge bosons.
A Higgs boson with mass 265-280 GeV and enhanced diphoton decay is predicted.
The model can fit both LHC Higgs data and gamma-ray line observations.
Abstract
We study a two Higgs doublet model augmented by a scalar dark matter particle that provides an excellent fit to the LHC Higgs data and the Fermi-LAT 135 GeV line. The heavy CP-even Higgs boson, which predominantly mediates annihilation and scattering, must have a coupling to weak gauge bosons at or below percent level to suppress the continuum gamma-ray spectrum below the limit from the Fermi-LAT data and the anti-proton spectrum constrained by the PAMELA data. Discovering or excluding this CP-even Higgs boson at the LHC with a mass between 265 and 280 GeV and an enhanced diphoton branching ratio is crucial to test this scenario.
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