### Abstract

We analyze how maximal entanglement is generated at the fundamental level in QED by studying correlations between helicity states in tree-level scattering processes at high energy. We demonstrate that two mechanisms for the generation of maximal entanglement are at work: i) $s$-channel processes where the virtual photon carries equal overlaps of the helicities of the final state particles, and ii) the indistinguishable superposition between $t$- and $u$-channels. We then study whether requiring maximal entanglement constrains the coupling structure of QED and the weak interactions. In the case of photon-electron interactions unconstrained by gauge symmetry, we show how this requirement allows reproducing QED. For $Z$-mediated weak scattering, the maximal entanglement principle leads to non-trivial predictions for the value of the weak mixing angle $\theta_W$. Our results illustrate the deep connections between maximal entanglement and the fundamental symmetries of high-energy physics.

Original language | English |
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Pages (from-to) | 1-18 |

Number of pages | 18 |

Journal | SciPost Physics |

Volume | 3 |

Issue number | 036 |

DOIs | |

Publication status | Published - 8 Mar 2017 |

### Bibliographical note

five pages, one figure### Keywords

- hep-th
- hep-ph
- quant-ph

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## Cite this

Cervera-Lierta, A., Latorre, J. I., Rojo, J., & Rottoli, L. (2017). Maximal Entanglement in High Energy Physics.

*SciPost Physics*,*3*(036), 1-18. https://doi.org/10.21468/SciPostPhys.3.5.036