Constraining electroweak baryogenesis models with searches for cascade decays of heavy Higgs bosons in ATLAS

The observed excess of matter over antimatter in the present-day universe is considered one of the most compelling evidence for the existence of physics beyond the Standard Model. Models with 2 Higgs Doublets can lead to successful baryogenesis provided that the spectrum of the additional Higgs bosons is hierarchical. This leads to the characteristic signature of a CP-odd Higgs boson, A, decaying into a CP-even Higgs boson, H, and a Z boson. The talk will present the first searches for this decay in final states with leptons and top quarks or with missing transverse energy and b-jets using 140 fb$^{-1}$ of LHC collision data. This search allows to probe the previously unexplored region with high $m_H$ and high $m_A$.