A search for new particles in an extended Higgs sector, characterized by a massive resonance $X$ decaying to a pair of scalar bosons $a$, which themselves decay to pairs of b quarks, is presented. The analysis is restricted to the mass ranges $m_a$ from 25 to 100 GeV and $m_X$ from 1 to 3 TeV. For these mass ranges, the decay products of each $a$ are expected to merge into a single large radius jet. Jet substructure and flavor identification techniques are used to identify these jets from background jets. The search is based on LHC proton-proton collision data at \sqrt{s}=13~\mathrm{TeV}, collected with the CMS detector in $2016$-$2018$, corresponding to an integrated luminosity of 138~\mathrm{fb}^{-1}. Model-specific limits at $95\%$ confidence level on the production cross section times branching fraction as a function of mass for $X\rightarrow aa\rightarrow (\mathrm{b}\bar{\mathrm{b}})(\mathrm{b}\bar{\mathrm{b}})$ are set, where both the $X \rightarrow a a$ and $a \rightarrow \mathrm{b}\bar{\mathrm{b}}$ branching fractions are assumed to be $100\%$. These are the first such limits on this process, and range between 1 and 30 fb for the considered mass ranges.

Log in to your administrator account to edit.