The extremely rare decays of particles known as neutral B mesons have been observed at CERN's Large Hadron Collider. The result may be a glimpse of physics beyond that of the standard model of particle physics. See Letter p.68
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CMS Collaboration & LHCb Collaboration. Nature 522, 68–72 (2015).
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Zieminska, D. Proton smasher spots rare particle decays. Nature 522, 42–43 (2015). https://doi.org/10.1038/nature14520