  Current LHC searches for non-supersymmetric singly-charged scalars, based on
Two-Higgs-Doublet models, in general focus the analysis on third-generation
fermions in the final state. However, singly-charged scalars in alternative
extensions of the scalar sector involve Yukawa couplings not proportional to
the mass of the fermions. Assuming the scalar decays into electrons and muons,
it can manifest cleaner experimental signatures. In this paper we suggest that
a singly-charged scalar singlet, with electroweak production, can start to be
probed in the near future with dedicated search strategies. Depending on the
strength of the Yukawa couplings, two independent scenarios are considered:
direct pair-production (small couplings) and single-production via virtual
neutrino exchange (large couplings). We show that, up to a mass as large as 500
GeV, most of the parameter space could be excluded at the 95% C.L. in a
high-luminosity phase of the LHC. Our results also apply to other frameworks,
provided the singly-charged scalar exhibits similar production patterns and
dominant decay modes.
