Date of this Version
PHYSICAL REVIEW LETTERS 123, 131802 (2019). DOI: 10.1103/PhysRevLett.123.131802
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.