The hunt for the rest of the Higgs bosons

Abstract: We assess the current state of searches at the LHC for additional Higgs bosons in light of both direct limits and indirect bounds coming from coupling measurements of the Standard Model-like Higgs boson. Given current constraints, we identify and study three LHC searches that are critical components of a comprehensive program to investigate extended electroweak symmetry breaking sectors: production of a heavy scalar or pseudoscalar with decay to tt¯$$ t\overline{t} $$; bb¯$$ b\overline{b} $$ and tt¯$$ t\overline{t} $$ associated production of a heavy scalar or pseudoscalar with decay to invisible final states; and tb¯$$ t\overline{b} $$ associated production of a charged Higgs with decay to tb¯$$ t\overline{b} $$. Systematic experimental searches in these channels would contribute to robust coverage of the possible single production modes of additional heavy Higgs bosons.