https://doi.org/10.1140/epjc/s10052-022-10207-1
Regular Article - Theoretical Physics
A dark leptophilic scalar with the updated muon 
anomaly
School of Science, Southwest University of Science and Technology, 621010, Mianyang, China
Received:
4
August
2021
Accepted:
13
March
2022
Published online:
13
April
2022
The muon anomaly was strengthened by recent experimental results at Fermilab, which may be signatures of new physics. A scenario of leptophilic scalar 
accounting for the muon anomaly is investigated in this paper. Although a light mainly decaying into standard model (SM) particles has been excluded by experiments, a dark leptophilic scalar predominantly decaying into invisible fermionic dark matter (DM) 
is still allowed. Considering the decay mode 
opened (here 
), the coupling preferred by the muon and the 
coupling are derived. The light/heavy (roughly 1 GeV as a benchmark value) can be tested by future experiments via DM/SM decay modes, and the contribution of to the anomalous magnetic moment of the tau lepton could be investigated at lepton colliders. The search for 
via -electron scattering in direct detection of DM is not sensitive due to a tiny -electron coupling, especially for 
.
© The Author(s) 2022
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