Measurement of the top quark mass in the all-jets final state at $$\sqrt{s}=13\,\text {TeV} $$ s

A top quark mass measurement is performed using 35.9 fb−1 of LHC proton-proton collision data collected with the CMS detector at √ s = 13 TeV. The measurement uses the tt all-jets final state. A kinematic fit is performed to reconstruct the decay of the tt system and suppress the multijet background. Using the ideogram method, the top quark mass (mt) is determined, simultaneously constraining an additional jet energy scale factor (JSF). The resulting value of mt = 172.34± 0.20 (stat+JSF)± 0.70 (syst) GeV is in good agreement with previous measurements. In addition, a combined measurement that uses the tt lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an mt measurement of 172.26± 0.07 (stat+JSF)± 0.61 (syst) GeV. This is the first combined mt extraction from the lepton+jets and all-jets channels through a single likelihood function. Published in the European Physical Journal C as doi:10.1140/epjc/s10052-019-6788-2. c © 2019 CERN for the benefit of the CMS Collaboration. CC-BY-4.0 license ∗See Appendix A for the list of collaboration members ar X iv :1 81 2. 10 53 4v 2 [ he pex ] 8 A pr 2 01 9

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