Extracting a Toponium Signal at the LHC with Spin and Quantum Information Tools
High Energy Physics - Phenomenology
2026-05-29 v2 High Energy Physics - Experiment
Abstract
We investigate near-threshold top-antitop production at the LHC, focusing on the impact of toponium formation on spin correlations and quantum information properties of the final state. Considering the top-antitop system as a mixed two-qubit state, we reconstruct spin density matrices via quantum tomography and evaluate several observables including some inspired by quantum information. We then compare their sensitivity in discriminating toponium effects from top-antitop production without these effects. Our results demonstrate that combining these variables is expected to significantly enhance sensitivity to toponium effects, bringing new ways to explore these subtle features.
Cite
@article{arxiv.2602.23426,
title = {Extracting a Toponium Signal at the LHC with Spin and Quantum Information Tools},
author = {Laura Antozzi and Esteban Chalbaud and Frédéric Déliot and Federica Fabbri and Miguel C. N. Fiolhais and Benjamin Fuks and António Onofre and Martin White and Pengxuan Zhu},
journal= {arXiv preprint arXiv:2602.23426},
year = {2026}
}
Comments
18 pages, 5 figures; version accepted by JHEP