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T: Fachverband Teilchenphysik

T 88: Top Physics IV

T 88.3: Vortrag

Freitag, 20. März 2026, 09:30–09:45, KH 00.011

Quantum Spin Correlations at Colliders — •Monika Alexandra Wüst and Thorsten Ohl — University of Würzburg, Institute of Theoretical Physics and Astrophysics, Würzburg

The study of beyond-classical correlations in final states at colliders has received a lot of attention recently. For example, entanglement of particle pairs has been observed at the LHC. Most importantly, measurements of such correlations provide new tests of the Standard Model. More complicated final states are being studied and future colliders with polarized initial states will boost the interest even further. Experimentally, the challenge is to reconstruct the spin-density matrix of a final state from phase space distributions. As a practical matter, the computation of spin-density matrices is beyond the reach of analytical calculations for multi-particle final states. While the event generator Whizard has computed the spin density matrix from the beginning, most of it is projected out in the common event formats. We present first results from an automated framework for the computation of general density matrices and quantum observables using event samples generated by Whizard. We discuss applications for spin-1/2 (qubit) and spin-1 (qutrit) particles in bipartite and tripartite quantum states at colliders. Analytic calculations are used to test components of Whizard matrix elements that have not been tested by comparing cross sections and classical correlations.

Keywords: Quantum Correlations; Quantum Tomography; High-Energy Scattering; Event Generators