The effect of the early kinetic decoupling in a fermionic dark matter model

Abstract

We study the effect of the early kinetic decoupling in a model of fermionic dark matter (DM) that interacts with the standard model particles only by exchanging the Higgs boson. There are two DM-Higgs couplings, namely CP-conserving and CP-violating couplings. If the mass of the DM is slightly below half of the Higgs boson mass, then the couplings are suppressed to obtain the measured value of the DM energy density by the freeze-out mechanism. In addition, the scattering processes of DM off particles in the thermal bath are suppressed by the small momentum transfer if the CP-violating DM-Higgs coupling is larger than the CP-conserving one. Due to the suppression, the temperature of the DM can differ from the temperature of the thermal bath. By solving coupled equations for the number density and temperature of the DM, we calculate the DM-Higgs couplings that reproduce the right amount of the DM relic abundance. We find that the couplings have to be larger than the one obtained without taking into account the difference in the temperatures. A consequence of the enhancement of the DM-Higgs couplings is the enhancement of the Higgs invisible decay branching ratio. The enhancement is testable at current and future collider experiments.

arXiv comment18 pages, 3 figures; typo corrected, updated the constraint from the Higgs invisible decay

References in corpus (33)

• Dark Matter Search Results from a One Tonne$\times$Year Exposure of XENON1T
• Results from a search for dark matter in the complete LUX exposure
• Gauge Singlet Scalars as Cold Dark Matter
• The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar
• Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment
• Physics reach of the XENON1T dark matter experiment
• micrOMEGAs4.1: two dark matter candidates
• Higgs Boson Studies at Future Particle Colliders
• Projected WIMP sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment
• Search for invisible decays of a Higgs boson produced through vector boson fusion in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Direct detection of Higgs-portal dark matter at the LHC
• Particle Models and the Small-Scale Structure of Dark Matter
• A Renormalizable Model for the Galactic Center Gamma Ray Excess from Dark Matter Annihilation
• Higgs portal, fermionic dark matter, and a Standard Model like Higgs at 125 GeV
• Can WIMP Dark Matter overcome the Nightmare Scenario?
• A cancellation mechanism for dark matter-nucleon interaction
• The Minimal Model for Dark Matter and Unification
• The Effects of QCD Equation of State on the Relic Density of WIMP Dark Matter
• Global analyses of Higgs portal singlet dark matter models using GAMBIT
• Dark matter and Higgs boson physics
• Fermionic dark matter with pseudo-scalar Yukawa interaction
• Combined analysis of effective Higgs portal dark matter models
• Effective Theory of WIMP Dark Matter supplemented by Simplified Models: Singlet-like Majorana fermion case
• LHC and Dark Matter Signals of Improved Naturalness
• Matter Power Spectrum in Hidden Neutrino Interacting Dark Matter Models: A Closer Look at the Collision Term
• The effect of quark interactions on dark matter kinetic decoupling and the mass of the smallest dark halos
• Singlet Majorana fermion dark matter: a comprehensive analysis in effective field theory
• Minimal renormalizable simplified dark matter model with a pseudoscalar mediator
• Loop-induced direct detection signatures from CP-violating scalar mediators
• Constraining Higgs mediated dark matter interactions
• Pseudo-Nambu-Goldstone dark matter from gauged $U(1{)}_{B-L}$ symmetry
• Current status and future prospects of the singlet-doublet dark matter model with $CP$ violation
• A Minimal Model for Neutral Naturalness and pseudo-Nambu-Goldstone Dark Matter

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