Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 67: Top Physics III

T 67.3: Vortrag

Donnerstag, 19. März 2026, 16:45–17:00, KH 00.011

Investigation of boosted top quarks and overlapping jets in the all-jets top quark mass measurement — •Yannek Ruwen Gruel, Peter Schleper, Johannes Lange, Hartmut Stadie, Lennert Griesing, and Lukas Schaller — Universität Hamburg, Hamburg, Germany

At high momenta, the distances between the jets of top quark decay products are smaller due to the Lorentz boost. As a result, the jets may overlap or even merge. This study investigates the influence of these effects on the measurement of the top quark mass with a resolved selection in the all-jet channel with the CMS experiment. For the event reconstruction, a kinematic fit is used that operates on the hypothesis of non-overlapping jets. Due to the strict trigger cuts for p_T, a large number of top quarks with high p_T are expected. The number of events with overlapping and merged jets is quantified and the distortion of the event reconstruction is studied.

Keywords: top quark; direct mass measurement; boosted top quark; all-jets channel; CMS