Search for a light charged Higgs boson decaying to a W boson and a CP-odd Higgs boson in trilepton final states in pp collisions at 13 TeV with CMS

A search for a light charged Higgs boson ($\mathrm{H^{+}}$) decaying to a W boson and a CP-odd Higgs boson (A) using trilepton final states (electron-dimuon or trimuon) is presented. The result is based on data from pp collisions at a center of mass energy of 13 TeV, recorded by the CMS detector, corresponding to an integrated luminosity of 35.9 $\mathrm{fb^{-1}}$. In this search, it is assumed that the $\mathrm{H^{+}}$ boson is produced in decays of top quarks, and the A boson decays to two oppositely charged muons. The first upper limits are set on the combined branching fraction for the decay chain.