Search for charged Higgs bosons using other final states

Three different searches for charged Higgs bosons with the ATLAS detector were presented. First, a search for a charged Higgs boson in t ¯t decays was presented, where one of the top quarks decays via t → H+b, followed by H+ → c ¯ s [1]. 95 % confidence level (CL) upper limits on B(t → bH+) varying between 5 % and 1 % for H+ masses between 90 GeV and 150 GeV, assuming B(H+ →c ¯ s) = 100% were presented. This was followed by the presentation of a search for charged Higgs bosons through the violation of lepton universality in t ¯t events, were signatures containing leptons (e/m) and/or a hadronically decaying t (thad) were used [2]. No significant deviation from the Standard Model predictions was observed. With the assumption that the branching fraction B(H+→tn ) is 100%, upper limits in the range 3.2% to 4.4% on the branching fraction B(t →bH+) for charged Higgs boson masses in the range 90−140 GeV were presented. Finally, a search for new particles in an extension to the Standard Model that includes a heavy Higgs boson (H0), an intermediate charged Higgs-boson pair (H±), and a light Higgs boson (h0)[3], was presented. The data was found to be consistent with Standard Model predictions, and 95% confidence-level upper limits on the product of cross section and branching ratio were presented. Those limits range from 0.065 to 43 pb as a function of H0 and H± masses, with mh0 fixed at 125 GeV.