Quantum SMEFT tomography: top quark pair production at the LHC

Abstract

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, $q\bar{q}$ 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.

8 pages, 5 figures + appendix; v2: minor changes, published version

References in corpus (5)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• LHAPDF6: parton density access in the LHC precision era
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• Quantum tops at the LHC: from entanglement to Bell inequalities
• Spin Correlation Effects in Top Quark Pair Production at the LHC

Cited by in corpus (7)

• Quantum information with top quarks in QCD
• Quantum discord and steering in top quarks at the LHC
• Testing entanglement and Bell inequalities in $H\to ZZ$
• Quantum state tomography, entanglement detection and Bell violation prospects in weak decays of massive particles
• Quantum information and CP measurement in $H\to {\tau }^{+}{\tau }^{-}$ at future lepton colliders
• Quantum entanglement and top spin correlations in SMEFT at higher orders
• Laboratory-frame tests of quantum entanglement in $H\to WW$