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A search for an extended Higgs sector, characterized by a massive resonance Xdecaying to a pair of spin-0 bosons $\phi$ that themselves decay to pairs ofbottom quarks, is presented. The analysis is restricted to the mass ranges$m_\phi$ from 25 to 100 GeV and $m_\mathrm{X}$ from 1 to 3 TeV. For these massranges, the decay products of each $\phi$ boson are expected to merge into asingle large-radius jet. Jet substructure and flavor identification techniquesare used to identify these jets. The search is based on CERN LHC proton-protoncollision data at $\sqrt{s} =$ 13 TeV, collected with the CMS detector in2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$.Model-specific limits are set on the product of the production cross sectionand branching fraction for X $\to$ $\phi\phi$ $\to$$(\mathrm{b\bar{b}})(\mathrm{b\bar{b}})$ as a function of mass, where both theX $\to$ $\phi\phi$ and $\phi$ $\to$ $\mathrm{b\bar{b}}$ branching fractions areassumed to be 100%. These limits are the first of their kind on this process,ranging between 30 and 1 fb at 95% confidence level for the considered massranges.

Search for new particles in an extended Higgs sector with four b quarks in the final state at $\sqrt{s} =$ 13 TeV