A search for a light charged Higgs boson (H+) decaying to a W boson and a CP-odd Higgs boson (A) in final states with eμμ or μμμ is performed using data from pp collisions at √s=13 TeV, recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 35.9 fb−1. In this search, it is assumed that the H+ boson is produced in decays of top quarks, and the A boson decays to two oppositely charged muons. The presence of signals for H+ boson masses between 100 and 160 GeV and A boson masses between 15 and 75 GeV is investigated. No evidence for the production of the H+ boson is found. Upper limits at 95% confidence level are obtained on the combined branching fraction for the decay chain, t → bH^+ → bW^+ A → bW^+ μ^+ ^μ−, of 1.9×10^−6 to 8.6×10^−6, depending on the masses of the H+ and A bosons. These are the first limits for these decay modes of the H+ and A bosons.
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A. M. Sirunyan et al., "Search for a Light Charged Higgs Boson Decaying to a W Boson and a CP-Odd Higgs Boson in Final States with eμμ or μμμ in Proton-Proton Collisions at √s = 13 TeV", Phys. Rev. Lett. 123, 131802, 23 September 2019, American Physical Society, https://doi.org/10.1103/PhysRevLett.123.131802