The strong force binds the constituents of nuclei together. Differences between the force's fundamental interactions and their mirror images were thought to have been observed in heavy-ion collisions, but new data challenge this picture.
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Dobrin, A. No sign of asymmetry in the strong force. Nature 546, 477–478 (2017). https://doi.org/10.1038/nature23086
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DOI: https://doi.org/10.1038/nature23086