No abstract

We explore the possibility that the discrepancy in the observed anomalous magnetic moment of the muon ∆a µ and the predicted relic abundance of Dark Matter by Planck data, can be explained in a lepto-philic 2-HDM augmented by a real SM singlet scalar of mass ∼ 10-80 GeV. We constrain the model from the observed Higgs Decay width at LHC, LEP searches for low mass exotic scalars and anomalous magnetic moment of an electron ∆a e . This constrained light singlet scalar serves as a portal for the fermionic Dark Matter, which contributes to the required relic density of the universe. A large region of model parameter space is found to be consistent with the present observations from the Direct and Indirect DM detection experiments. arXiv:1809.07877v2 [hep-ph]

In this work, we investigate the impact of recent anomalous (g − 2)µ measurement with ∼ 4σ deviation from the SM, probing its effect on a light GeV scale fermionic dark matter (DM). The (g − 2)µ anomaly can be readily explained in the a beyond the SM (BSM) U (1)L µ−Lτ scenario, where only a portion of hitherto allowed parameter space can explain the anomaly. This constraint impacts the enhancement of the neutrino floor, the neutrino background in the DM direct detection experiments. The GeV scale DM is severely constrained by the (g − 2)µ result as it restricts the Z mass in the range of 20 − 200 MeV. That restriction results in absence of s-channel resonant annihilation of the GeV scale DM, therefore resulting in over abundance of the DM relic. Even if t-channel annihilation aided by large couplings can bring the relic density in the observed range, direct detection cross section shoots up. Super-GeV DM gets almost ruled out where as sub-GeV DM gets severely constrained.