Measurement of the Top Quark Mass in the All-jets Final State at and Combination with the Lepton+jets Channel

A top quark mass measurement is performed using of LHC proton-proton collision data collected with the CMS detector at . The measurement uses the all-jets final state. A kinematic fit is performed to reconstruct the decay of the  system and suppress the multijet background. Using the ideogram method, the top quark mass ( ) is determined, simultaneously constraining an additional jet energy scale factor ( ). The resulting value of is in good agreement with previous measurements. In addition, a combined measurement that uses the lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an measurement of . This is the first combined extraction from the lepton+jets and all-jets channels through a single likelihood function.