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

A search for an extended Higgs sector, characterized by a massive resonance X decaying to a pair of spin-0 bosons $\phi$ that themselves decay to pairs of bottom 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 mass ranges, the decay products of each $\phi$ boson are expected to merge into a single large-radius jet. Jet substructure and flavor identification techniques are used to identify these jets. The search is based on CERN LHC proton-proton collision data at $\sqrt{; ; ; s}; ; ; =$ 13 TeV, collected with the CMS detector in 2016-2018, corresponding to an integrated luminosity of 138 fb$^{; ; ; -1}; ; ; $. Model-specific limits are set on the product of the production cross section and branching fraction for X $\to$ $\phi\phi$ $\to$ $(\mathrm{; ; ; b\bar{; ; ; b}; ; ; }; ; ; )(\mathrm{; ; ; b\bar{; ; ; b}; ; ; }; ; ; )$ as a function of mass, where both the X $\to$ $\phi\phi$ and $\phi$ $\to$ $\mathrm{; ; ; b\bar{; ; ; b}; ; ; }; ; ; $ branching fractions are assumed 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 mass ranges.

High energy physics ; Experimental particle physics ; LHC ; CMS ; p p: scattering ; p p: colliding beams ; B: decay ; tau: hadronic decay ; interaction: gauge ; interaction: model ; transverse momentum: missing-energy ; new physics: search for ; mass spectrum: transverse ; black hole: quantum ; vector boson: mass ; W': leptonic decay ; sensitivity ; leptoquark: coupling ; CERN LHC Coll ; leptoquark: mass: lower limit ; anomaly ; channel cross section: upper limit ; effective field theory ; Higgs

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