According to the Standard Model (SM) of particle physics, fewer than one in every 10 billion kaons undergo this specific decay.

CERN scientists observed a rare kaon decay into a pion and two neutrinos, a significant find confirming predictions of the Standard Model and hinting at possible new physics. Physicists at the European Organization for Nuclear Research,

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Scientists at CERN have discovered an ultra-rare particle decay process, opening a new path to find physics beyond our understanding of how the building blocks of matter interact.