Current status and muon g − 2 explanation of lepton portal dark matter

Abstract

In this paper, we summarize phenomenology in lepton portal dark matter (DM) models, where DM couples to leptons and extra leptons/sleptons. There are several possible setups: a DM field is either a complex/real scalar or a Dirac/Majorana fermion, and chiralities of leptons that couple to the DM are different according to the spin of the DM. We discuss the prediction of each model and compare it with the latest experimental constraints from the DM detections, the LHC, and the flavor experiments. We also propose simple setups to resolve the discrepancy in the anomalous magnetic moment of muon.

Radiative muon mass models and (g − 2)μ

“…However, these limits can be evaded if ψ is Majorana as the scattering rate becomes velocity suppressed. This model, with Majorana ψ but a tree-level muon mass, has been found to fit the (g − 2) µ anomaly and provide a viable dark matter candidate in [38]. It would be very interesting to investigate whether a radiative muon mass, the (g − 2) µ anomaly, and viable dark matter can all be accommodated simultaneously.…”

“…Its freezeout abundance would be determined by t-channel ψ and χ exchange and possibly coannihilation. While a complex scalar would have stringent constraints from direct detection due to the one-loop photon penguin diagram, these weaken considerably for real scalar dark matter where the leading processes occur at two-loop [38,70]. A similar model, without the chiral symmetries and with a tree-level muon mass, can fit the (g − 2) µ anomaly and provide a viable dark matter candidate [36,38,41].…”

“…If it is also neutral, this state may be a dark matter candidate, suggesting an intriguing link between the origins of fermion mass and dark matter. Similar models with a viable dark matter candidate but a tree-level muon mass have been studied in [36][37][38][39][40][41].…”

Explaining (g−2)μ,e , the KOTO anomaly, and the MiniBooNE excess in an extended Higgs model with sterile neutrinos

“…A new physics solution is needed to explain them simultaneously. A few possible solutions in other contexts have been considered in literature [14,[96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111].…”

Probing the dark axion portal with muon anomalous magnetic moment

“…The previous 3.7 σ discrepancy between the E821 measurement and the SM prediction has stimulated many novel ideas. An incomplete list includes lepton flavor violation [25], Z [26][27][28][29], neutral scalars [30][31][32][33], ALP [34], leptoquarks [35,36], supersymmetry [37][38][39][40][41][42][43][44], dark photon [45][46][47][48][49], and dark matter portals [50][51][52][53][54][55].…”