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Manipulating Bell nonlocality and entanglement in polarized electron-positron annihilation

Hong-Wei Zhang1,2,*, Xu Cao2,3,4,†, and Tai-Fu Feng1,‡

  • *Contact author: hweiz0929@163.com
  • †Contact author: caoxu@impcas.ac.cn
  • ‡Contact author: fengtf@hbu.edu.cn

Phys. Rev. D 113, 114022 – Published 11 June, 2026

DOI: https://doi.org/10.1103/5br1-z3g9

Abstract

The hyperon-antihyperon pairs produced in electron-positron annihilation as a massive two-qubit quantum system can be used to study the quantum correlations at high energies. This paper is theoretically dedicated to how polarization of lepton beams manipulates the Bell nonlocality and entanglement of hyperon pair systems. The response of the Clauser–Horne–Shimony–Holt parameter, concurrence, and negativity to the polarization degree of the beam is numerically calculated by exploiting the joint spin density matrix of hyperon-antihyperon pairs. Different influences of longitudinal and transverse polarization of beams on entanglement are found and compared. The results provide alternative perspectives for the decay of charmonium to hyperon pairs.

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