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  • Letter
  • Open Access

Bell inequality is violated in B0→J/ψK*(892)0 decays

M. Fabbrichesi1, R. Floreanini1, E. Gabrielli2,1,3,4, and L. Marzola4

  • 1INFN, Sezione di Trieste, Via Valerio 2, I-34127 Trieste, Italy
  • 2Physics Department, University of Trieste, Strada Costiera 11, I-34151 Trieste, Italy
  • 3CERN, Theoretical Physics Department, Geneva, Switzerland
  • 4Laboratory of High-Energy and Computational Physics, NICPB, Rävala 10, 10143 Tallinn, Estonia

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Phys. Rev. D 109, L031104 – Published 23 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.L031104

Abstract

The violation of the Bell inequality is one of the hallmarks of quantum mechanics and can be used to rule out local deterministic alternative descriptions. We utilize the data analysis published by the LHCb Collaboration on the helicity amplitudes for the decay B0→J/ψK*(892)0 to compute the entanglement among the polarizations of the final vector mesons and the violation of the Bell inequality that it entails. We find that quantum entanglement can be detected with a significance well above 5σ (nominally 84σ) and Bell inequality is violated with a significance well above 5σ (nominally 36σ)—thereby firmly establishing these distinguishing feature of quantum mechanics at high energies in a collider setting and in the presence of strong and weak interactions. Entanglement is also present and the Bell inequality is violated in other decays of the B mesons into vector mesons, but with lesser significance.

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Information

Phys. Rev. D 109, L031104– Published 23 February, 2024
  • Received 5 June 2023
  • Accepted 24 January 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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