Measurement of the top quark mass in the all-jets final state at $$\sqrt{s}=13\,\text {TeV} $$ s = 13 TeV and combination with the lepton+jets channel
Аннотация
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 (m t ) is determined, simultaneously constraining an additional jet energy scale factor (JSF). The resulting value of m t = 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 m t measurement of 172.26 0.07 (stat+JSF) 0.61 (syst) GeV. This is the first combined m t extraction from the lepton+jets and all-jets channels through a single likelihood function.
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