This contribution details the search for
heavy neutral Higgs bosons from an extended Higgs sector decaying into b-quarks and produced in association with at least one b-quark. These scalar
states are predicted to have a significantly enhanced coupling to b-quarks in
various scenarios within MSSM and 2HDM models at large tanβ. The analyzed
data were collected by the CMS experiment at 13 TeV centre-of-mass energy
in pp collisions during the LHC Run 2, accounting for up to 127 fb−1. This analysis benefits from improved data-driven background modelling and explores mass hypotheses in two categories: a fully-hadronic category sensitive to masses above 300 GeV, and a semi-leptonic category extending sensitivity down to 125 GeV. No significant excess was observed, and this study sets the most stringent exclusion limits to date on the cross section times branching ratio of the process. The measurements are used to constrain the parameter space of several 2HDM and MSSM benchmark scenarios.
