Froggatt-Nielsen model for leptophilic scalar dark matter decay

Abstract

We construct a model of decaying, TeV-scale scalar dark matter motivated by data from the PAMELA and Fermi-LAT experiments. By introducing an appropriate Abelian discrete symmetry and an intermediate scale of vector-like states that are responsible for generating lepton Yukawa couplings, we show that Planck-suppressed corrections may lead to decaying dark matter that is leptophilic and has the desired lifetime. The dark matter candidate decays primarily to lepton/antilepton pairs, and at a subleading rate to final states with a lepton, anti-lepton and standard model Higgs boson. We show that the model can reproduce the observed positron flux and positron fraction while remaining consistent with the bounds on the cosmic ray antiproton flux.

Leptophilic dark matter and the anomalous magnetic moment of the muon

“…Although constraints from positron flux measurements are stronger for annihilations into electrons and muons, scenarios where leptophilic DM emerges as a thermal relic remain viable [48][49][50][51][52][53].…”

Lepton-flavored dark matter

“…Here, we choose q 2 = (189 GeV) 2 because it is the lowest LEPII center-of-mass energy with a large luminosity (> 100 pb −1 ). Our results are affected only slightly by this approximation 9. We note that our expression for the direct-detection cross section, Eq.…”

“…Our results are affected only slightly by this approximation. 9 We note that our expression for the direct-detection cross section, Eq. (6), is also dependent on the choice of renormalization conditions.…”

“…We note that this expression depends significantly on the renormalization scale μ, which is undetermined in our analysis. 9 To obtain a rough constraint, we take the reference value μ = 1 TeV, obtaining 8 Here, we choose q 2 = (189 GeV) 2 because it is the lowest LEPII center-of-mass energy with a large luminosity (> 100 pb −1 ). Our results are affected only slightly by this approximation.…”

“…We note that this expression depends significantly on the renormalization scale µ, which is undetermined in our analysis. 9 To obtain a rough constraint, we take the reference value µ = 1 TeV, obtaining…”