AI Summary

Researchers at the Paul Scherrer Institute examined about 25 billion neutrons and found no evidence that they disappear into a proposed mirror world. The study, published in Physical Review Letters, rules out with high certainty that ordinary neutrons convert into mirror neutrons. The mirror‑world hypothesis, which suggests a parallel universe containing mirror electrons, protons, and neutrons that interact only weakly with our particles, has been a long‑standing theoretical idea. The PSI team’s results constrain the possibility that such mirror particles could account for dark matter.

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