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Abstract
Abstract We discuss the constraints on Dark Matter coming from the LHC Higgs data and WMAP relic density measurements for the Inert Doublet Model, which is one of the simplest extensions of the Standard Model providing a Dark Matter candidate. We found that combining the diphoton rate R γγ and the Ω DM h 2 data one can set strong limits on the parameter space of the Inert Doublet Model, stronger or comparable to the constraints provided by the XENON100 experiment for low and medium Dark Matter mass.
Highlights
JHEP09(2013)055 provides an example of a Higgs portal DM
We found that combining the diphoton rate Rγγ and the ΩDM h2 data one can set strong limits on the parameter space of the Inert Doublet Model, stronger or comparable to the constraints provided by the XENON100 experiment for low and medium Dark Matter mass
Combining them with the WMAP results excludes a large part of the IDM parameter space, setting limits on DM that are stronger or comparable to those obtained by XENON100
Summary
The Inert Doublet Model is defined as a 2HDM with an exact D (Z2 type) symmetry: φS → φS, φD → −φD [20, 21], i.e. a 2HDM with a D-symmetric potential, vacuum state and Yukawa interaction (Model I). [50] that in the IDM the contributions from four additional scalar states will in general lead to the relaxation of the stability bound, as compared to the SM This allows the IDM to be valid (i.e. having a stable, and not a metastable vacuum) up to the Planck scale, for a wide portion of the parameter space of the IDM for the currently measured values of the Higgs boson and top quark masses. Parameters of the potential are constrained by the following bound on the eigenvalues of the high-energy scattering matrix of the scalar sector: |Λi| < 8π [42,43,44], which leads to the upper limit on the DM quartic self-coupling: λm ax = 8.38. Proper relic density (1.1) can be obtained by tuning the λ345 coupling, and in some cases by the coannihilation between H and other dark scalars and interference processes with virtual EW gauge bosons [20, 21, 23, 24, 34,35,36,37,38,39,40, 54]
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