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Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Top-Physik III

T 83.2: Talk

Thursday, March 28, 2019, 16:15–16:30, S10

Measurement of the top quark mass in the all-jets final state at s=13 TeV and combination with the lepton+jets channelChristoph Garbers, •Johannes Lange, Peter Schleper, and Hartmut Stadie — Institut für Experimentalphysik, Universität Hamburg

The top quark mass mt is measured using 35.9 fb−1 of proton-proton collision data collected with the CMS experiment at the LHC at √s=13 TeV. The tt all-jets final state is used, i.e., events consisting of at least six jets are selected. The full tt system is reconstructed using a kinematic fit, allowing to improve the mass resolution and suppress multijet background. An estimation of the remaining background is performed using data events. Using the ideogram method, mt is extracted, simultaneously constraining an additional jet energy scale factor.

In addition, a combined measurement using the all-jets and lepton+jets final states is presented. The likelihoods for both channels are combined and a simultaneous mass extraction is performed.

Differences in the determination of systematic uncertainties with respect to previous results obtained at √s=7 and 8 TeV are discussed.

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