SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 135: Top Mass, Top BSM
T 135.3: Vortrag
Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0201
Measurement of the jet mass distribution of boosted top quarks and 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, Wien
We present a measurement of the jet mass distribution in fully hadronic decays of boosted top quarks in pp collisions recorded by the CMS experiment in Run-2 of the LHC. The measurement is performed in the lepton+jets channel of top quark pair production. The top quark decay products of the all-hadronic decay cascade are reconstructed with a single large-radius jet with transverse momentum greater than 400 GeV. The top quark mass is extracted from the normalised differential top quark pair production cross section at particle level. The uncertainties arising from the calibration of the jet mass scale and modelling of the final state radiation in simulation are improved by dedicated studies of the jet substructure. This results in a significant increase in precision in the top quark mass with respect to an earlier measurement, now reaching a precision below 1 GeV.