Light vector dark matter with scalar mediator and muon g-2 anomaly

We study a model with a vector dark matter (DM) candidate interacting with the standard model (SM) charged leptons through a scalar portal. The dark matter candidate acquires mass when the complex scalar breaks an Abelian gauge symmetry spontaneously. The scalar interacts with the SM charged leptons through a dimension-6 operator. The scalar mediator induces elastic scattering of dark matter with electrons at tree level and also DM-nucleon interaction when the effects from scalar-Higgs mixing are taken into account. Given the recent results from Xenon1T upper bounds on DM-electron elastic scattering cross sections where the strongest sensitivity lies in the range

\sim O (1) GeV

, we find the viable space in the parameter space respecting constraints from the observed relic density, direct detection, muon

(g_{μ} - 2)

anomaly,

e^{+} e^{-}

colliders, electron beam-dump experiments and astrophysical observables. It is shown that the current upper bounds of Xenon1T on DM-electron interactions are partially sensitive to the regions in the viable parameter space which is already excluded by the electron beam-dump experiment, Orsay. We also find that there are viable DM particles with masses

\sim O (1) GeV

evading the direct detection but standing well above the neutrino floor. Almost the same viable regions are found when we apply the direct detection upper limits on the DM-proton spin-independent cross section.

Note:

20 pages, 6 figures- version accepted for publication in PRD

magnetic moment: anomaly
muon: magnetic moment
dark matter: vector
symmetry: gauge
gauge: abelian
dark matter: elastic scattering
cross section: elastic scattering
dark matter: mass
higher-order
mediation

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