Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the $\tau \tau$bb final state at 13 TeV

Abstract

A search for a heavy Higgs boson H decaying into the observed Higgs boson h with a mass of 125 GeV and another Higgs boson h${}_{\mathrm{S}}$ is presented. The h and h${}_{\mathrm{S}}$ bosons are required to decay into a pair of tau leptons and a pair of b quarks, respectively. The search uses a sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb${}^{-1}$. Mass ranges of 240-3000 GeV for $m_{\mathrm{H}}$ and 60-2800 GeV for $m_{{\mathrm{h}}_{\mathrm{S}}}$ are explored in the search. No signal has been observed. Model independent 95% confidence level upper limits on the product of the production cross section and the branching fractions of the signal process are set with a sensitivity ranging from 125 fb (for $m_{\mathrm{H}}$ $=$ 240 GeV) to 2.7 fb (for $m_{\mathrm{H}}$ $=$ 1000 GeV). These limits are compared to maximally allowed products of the production cross section and the branching fractions of the signal process in the next-to-minimal supersymmetric extension of the standard model.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-20-014 (CMS Public Pages)

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