CMS-PAS-B2G-20-003

CMS-PAS-B2G-20-003
Search for new particles in an extended Higgs sector in the four b quark final state at $\sqrt{s}=$ 13 TeV
CMS Collaboration
July 2021

Abstract: 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 TeV, collected with the CMS detector in 2016-2018, corresponding to an integrated luminosity of 138 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.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 835 (2022) 137566. The superseded preliminary plots can be found here.

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