SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 135: Top Mass, Top BSM

T 135.5: Vortrag

Donnerstag, 23. März 2023, 18:30–18:45, HSZ/0201

Prospects for a Measurement of Quantum Entanglement in Top Quark Pair Production in the Lepton+Jets Final State — Marcel Niemeyer, Arnulf Quadt, Baptiste Ravina, •Theresa Reisch, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

Quantum entanglement is a fundamental prediction of quantum mechanics. Experimental achievements with electrons and photons were recognised by the Nobel Prize in Physics 2022. At the LHC, quantum entanglement could be observed for the first time in quarks, testing quantum mechanics at high energies. Therefore, a sensitivity study for a possible measurement of quantum entanglement in the top quark pair production in the lepton+jets final state is presented. The angular separation between the decay products of the top quarks can act as a marker of quantum entanglement, when the two top quarks are produced near threshold. To take advantage of the presence of c-quarks in W decays in l+jets channel, c-tagging is used based on the working points of the current b-tagging algorithm. The result is then unfolded using Profile Likelihood Unfolding to remove detector effects. The study is performed with ATLAS Monte Carlo simulations under Run 2 conditions.