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A top quark mass measurement is performed using 35.9 fb$^{-1}$ of LHCproton-proton collision data collected with the CMS detector at $\sqrt{s} =$ 13TeV. The measurement uses the $\mathrm{t\overline{t}}$ all-jets final state. Akinematic fit is performed to reconstruct the decay of the$\mathrm{t\overline{t}}$ system and suppress the multijet background. Using theideogram method, the top quark mass ($m_\mathrm{t}$) is determined,simultaneously constraining an additional jet energy scale factor (JSF). Theresulting value of $m_\mathrm{t}$ = 172.34 $\pm$ 0.20 (stat+JSF) $\pm$ 0.70(syst) GeV is in good agreement with previous measurements. In addition, acombined measurement that uses the $\mathrm{t\overline{t}}$ lepton+jets andall-jets final states is presented, using the same mass extraction method, andprovides an $m_\mathrm{t}$ measurement of 172.26 $\pm$ 0.07 (stat+JSF) $\pm$0.61 (syst) GeV. This is the first combined $m_\mathrm{t}$ extraction from thelepton+jets and all-jets channels through a single likelihood function.

Measurement of the top quark mass in the all-jets final state at $\sqrt{s} =$ 13 TeV and combination with the lepton+jets channel