Search for a light charged Higgs boson decaying to a W boson and a CP-odd Higgs boson in final states with e$μμ$ or $μμμ$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV (1905.07453v2)
Abstract: 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 e$\mu\mu$ or $\mu\mu\mu$ is performed using data from pp collisions at $\sqrt{s}=$ 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 $\to$ bH$+$ $\to$ bW$+$A $\to$ bW$+\mu+\mu-$, of 1.9 $\times$ 10${-6}$ to 8.6 $\times$ 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.