Geneva, 25 September 2024. At a seminar at CERN this week, the NA62 collaboration reported the unequivocal confirmation of the ultra-rare decay of a positively charged kaon into a positively charged pion and a neutrino–antineutrino pair. Experiments including NA62 have previously measured and seen evidence of this process. However, this is the first time it has been measured with a statistical significance of five standard deviations, crossing the threshold traditionally required to claim a discovery in particle physics...
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