Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 23: Top Physics I

T 23.8: Vortrag

Dienstag, 17. März 2026, 18:00–18:15, KH 00.011

Measurement prospects for the top-antitop energy asymmetry in the production with an additional jet in the resolved topology with ATLAS — •Jessica Höfner, Annika Stein, Frederic Fischer, and Lucia Masetti — University Mainz, Insitute for physics

The top quark is the heaviest particle in the Standard Model (SM) of particle physics and the only quark which decays before hadronization can happen. The top quark is suitable for the search of physics beyond the SM of particle physics (BSM). There could be even heavier particles and they might become observable at higher center-of-mass energies, and the top quark could potentially interact with them. At the currently reachable center-of-mass energies, however, the impact of BSM physics might only be indirectly observable via the variation of properties of the production or decay of SM particles. In the production of a top-antitop pair with an additional jet at the LHC the energy asymmetry, complementary to the rapidity asymmetry, can be measured. The energy asymmetry is expected in the SM, but also sensitive to physics beyond the SM and therefore it is of high interest to measure this observable. The measurement is performed in the single lepton and jets resolved topology, in which the quarks are reconstructed separately in small-R jets. The challenge in the event reconstruction is to assign the jets to the correct mother particle, which is done using a neural network. This presentation will show the performance of the neural network and the impact of the event reconstruction on the energy asymmetry measurement.

Keywords: Top quarks; Energy asymmetry