Quantum tops at circular lepton colliders

Abstract

We study the quantum properties of top quark pairs in lepton colliders with unpolarised beams, including spin correlations, entanglement, and violation of Bell inequalities. We present analytical results in the SM and in the SMEFT and discuss several practical aspects, like the choice of quantization axes and $t\bar{t}$ threshold effects. We also note a correspondence between parity symmetry and entanglement. We find that quantum observables exhibit a rich phenomenology in the SM, and can also provide additional leverage in detecting new physics residing at higher scales.

arXiv comment33 pages plus Appendix, 16 figures

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Cited by in corpus (16)

• Observation of quantum entanglement in top quark pair production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Quantum Information meets High-Energy Physics: Input to the update of the European Strategy for Particle Physics
• Optimizing Entanglement and Bell Inequality Violation in Top Anti-Top Events
• Quantum properties of $H\to V{V}^{\ast }$: precise predictions in the SM and sensitivity to new physics
• Interference Resurrection of the $\tau$ Dipole through Quantum Tomography
• Toponium: the smallest bound state and simplest hadron in quantum mechanics
• Higher-Order Corrections to Quantum Observables in $h\to W{W}^{\ast }$
• Quantum Entanglement is Quantum: ZZ Production at the LHC
• Three-Body Non-Locality in Particle Decays
• Entanglement entropy, Monte Carlo event generators, and soft gluons DIScovery
• Universality of entanglement in gluon dynamics
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• Single-spin measurements and heavy new physics in the $e^{+}{e}^{-}\to t\bar{t}$ process at an FCC-ee
• Colliders are not Testing Locality via Bell's Inequality nor Providing an Unconditional Proof of Entanglement
• Investigating topped hadrons to probe the boundaries of the potential model
• Gauge and diffeomorphism invariance from quantum information principles