Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Top Physics III

T 67.1: Talk

Thursday, March 19, 2026, 16:15–16:30, KH 00.011

Towards a top quark mass measurement in the all-jets final state using full Run 2 data — •Lennert Griesing, Peter Schleper, Johannes Lange, Hartmut Stadie, Lukas Schaller, and Yannek Gruel — Institute of Experimental Physics, Hamburg University, Germany

A precise measurement of the top quark mass is important for testing the Standard Model of particle physics. While the CMS experiment has achieved high precision using a profile likelihood fit in the lepton+jets final state, it has not been applied to the all-jets final state, yet. This final state remains challenging due to the large QCD multijet background and the complexities of the event reconstruction.

A new measurement in this channel is being developed using data collected with the CMS experiment at the LHC during Run 2 at √s= 13  TeV. The analysis strategy combines optimized event selection, data-driven background estimation, and systematic uncertainty studies tailored to the all-jets final state. A profile-likelihood fit is employed to extract the top quark mass while simultaneously constraining systematic uncertainties. Leveraging the full statistical power of the dataset, this analysis aims to provide a complementary, high-precision measurement of the top quark mass. We report on the current status of this analysis.

Keywords: Top Quark; Direct mass measurement; CMS