CERN reports first observation of ultra-rare particle decay – UKRI
On 24 September 2024, the NA62 collaboration announced the first experimental observation of the ultra-rare decay of the charged kaon into a charged pion and a neutrino-antineutrino pair. The decay had a significance of 5 sigma (the criterion used in particle physics to declare a discovery), measuring the decay rate to a 25% relative precision. […]
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