2022/03/31 by Rafael Aoude, Eric Madge, Fabio Maltoni +1 · 24 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Large Hadron Collider #Observable #Pair production #Particle physics #Particle physics theoretical and experimental studies #Parton #Phase space #Physics #Quantum #Quantum Chromodynamics and Particle Interactions #Quantum entanglement #Quantum mechanics #Quark #Standard Model (mathematical formulation) #Theoretical physics #Top quark #hep-ex #hep-ph
paper · pdf · open access · doi:10.1103/physrevd.106.055007
published in Physical review. D/Physical review. D. 106(5) (American Physical Society) · 8 pages, 5 figures + appendix; v2: minor changes, published version
openalex created_date 2022/04/03 · arxiv created 2022/08/30 · openalex publication_date 2022/09/06 · arxiv updated 2022/09/21 · openalex updated_date 2026/08/05
Quantum information observables, such as entanglement measures, provide a powerful way to characterize the properties of quantum states. We propose to use them to probe the structure of fundamental interactions and to search for new physics at high energy. Inspired by recent proposals to measure entanglement of top quark pairs produced at the LHC, we examine how higher-dimensional operators in the framework of the SMEFT modify the Standard Model expectations. We explore two regions of interest in the phase space where the Standard Model produces maximally entangled states: at threshold and in the high-energy limit. We unveil a non-trivial pattern of effects, which depend on the initial state partons, q q or gg, on whether only linear or up to quadratic SMEFT contributions are included, and on the phase space region. In general, we find that higher-dimensional effects lower the entanglement predicted in the Standard Model.