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

Abstract

A search for an extended Higgs sector, characterized by a massive resonance X decaying to a pair of spin-0 bosons $\varphi$ that themselves decay to pairs of bottom quarks, is presented. The analysis is restricted to the mass ranges $m_{\varphi }$ from 25 to 100 GeV and $m_{\mathrm{X}}$ from 1 to 3 TeV. For these mass ranges, the decay products of each $\varphi$ 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 $\to$ $\varphi \varphi$ $\to$ $(\mathrm{b}\bar{\mathrm{b}})(\mathrm{b}\bar{\mathrm{b}})$ as a function of mass, where both the X $\to$ $\varphi \varphi$ and $\varphi$ $\to$ $\mathrm{b}\bar{\mathrm{b}}$ 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.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-20-003 (CMS Public Pages)

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