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arXiv · 2203.00480

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

CMS Collaboration
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Abstract

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

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CMS Collaboration. 2022-11-21. Search for new particles in an extended Higgs sector with four b quarks in the final state at $\sqrt{s} =$ 13 TeV. https://doi.org/10.1016/j.physletb.2022.137566

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