In a groundbreaking experiment at CERN, particle physicists are on the brink of uncovering new physics beyond the Standard Model. The NA62 experiment, led by a team of researchers including Cristina Lazzeroni from the University of Birmingham, has successfully observed and measured a rare particle decay event that scientists have long sought to witness. The event? The decay of a charged kaon into a charged pion, a neutrino, and an antineutrino—a channel so rare that it has earned the status of a "golden" event in particle physics.