Abstract
The muon g-2 anomaly was strengthened by recent experimental results at Fermilab, which may be signatures of new physics. A scenario of leptophilic scalar phi _L accounting for the muon g-2 anomaly is investigated in this paper. Although a light phi _L mainly decaying into standard model (SM) particles has been excluded by experiments, a dark leptophilic scalar phi _L predominantly decaying into invisible fermionic dark matter (DM) chi {bar{chi }} is still allowed. Considering the decay mode phi _L rightarrow chi {bar{chi }} opened (here m_{phi _L} = 3 m_chi ), the coupling preferred by the muon g-2 and the phi _L-chi coupling are derived. The light/heavy phi _L (roughly 1 GeV as a benchmark value) can be tested by future experiments via DM/SM decay modes, and the contribution of phi _L to the anomalous magnetic moment of the tau lepton could be investigated at lepton colliders. The search for chi via chi -electron scattering in direct detection of DM is not sensitive due to a tiny phi _L-electron coupling, especially for m_chi > rsim m_mu .
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