Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Top Quarks: Properties 1
T 7.2: Vortrag
Montag, 21. März 2022, 16:30–16:45, T-H20
Measurement of the jet mass distribution in hadronic decays of boosted top quarks and determination of the top quark mass with CMS — •Alexander Paasch1, Johannes Haller1, Roman Kogler2, and Dennis Schwarz3 — 1Institut für Experimentalphysik, Universität Hamburg — 2DESY, Hamburg — 3Austrian Academy of Sciences, Vienna
The top quark is the heaviest known elementary particle. Due to its high mass it plays an important role in the electroweak sector of the Standard Model and the measurement of its properties is of special interest. In contrast to conventional top quark mass measurements, we provide an analysis in the boosted regime. At these high energies, the top quark decay products are collimated and are clustered into a single large-radius jet with a mass sensitive to the top quark mass.
In this talk, we present the measurement of the jet mass distribution and top quark mass in hadronic decays of boosted top quarks, using 137 fb−1 of data collected by the CMS experiment during the LHC Run-2. New techniques such as a refined calibration of the jet mass scale and improving the description of the final state radiation through a measurement of jet substructure variables substantially increase the precision compared to earlier analyses. The result represents a large step towards the precision observed in measurements at threshold production.