For a benchmark singly charged scalar that decays to leptons plus invisible particles, LHC data still allow masses above about 185 GeV and in a window near 80-125 GeV, and a boosted-decision-tree search could probe these regions more efficiently than standard cut-based analyses.
Searching for Weak Singlet Charged Scalar at the Large Hadron Collider
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abstract
Weak singlet charged scalar exists in many new physics models beyond the Standard Model. In this work we show that a light singlet charged scalar with mass above 65~GeV is still allowed by the LEP and LHC data. The interactions of the singlet charged scalar with the Standard Model particles are described by operators up to dimension-5. Dominant decay modes of the singlet charged scalar are obtained, and a subtlety involving field redefinition and gauge fixing due to a dimension-5 operator is also clarified. We demonstrate that it is promising to observe the singlet charged scalar at the LHC.
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Closing in on singly charged scalars
For a benchmark singly charged scalar that decays to leptons plus invisible particles, LHC data still allow masses above about 185 GeV and in a window near 80-125 GeV, and a boosted-decision-tree search could probe these regions more efficiently than standard cut-based analyses.