Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Electroweak Physics I (Weak Mixing Angle, Tau Production)

T 35.4: Talk

Tuesday, April 1, 2025, 17:00–17:15, VG 2.103

Prospects of measuring quantum entanglement in ττ final states at the LHC and future colliders — •Cedric Breuning, Philip Bechtle, Klaus Desch, and Christian Grefe — Physikalisches Institut, Rheinische Friedrich-Wilhelms Universität Bonn, Nussallee 12, 53115 Bonn, Germany

We introduce a method to test quantum entanglement at colliders in the ττ final state. The prospects to perform these measurements in e⁺e⁻ collisions at future colliders like the FCC-ee are evaluated using simulated events with a fast detector simulation. We will present two dedicated analyses using either Z→ττ or H→ττ at e⁺e⁻ at centre of mass energies of √s = 91.2 GeV and √s = 240 GeV, respectively. Prospects and limitations of doing similar measurements at the LHC will be shown. Finally, we will discuss loopholes and collider specific problematics, which influence the interpretation of the result.

Keywords: Quantum Entanglement; Higgs; Future Colliders