CERN finds evidence of ultra-rare particle decay after 40-year search

· Science

CERN scientists have found evidence of a particle decay so rare that it occurs only about once in roughly 10 billion decays, ending a search spanning more than 40 years, ScienceDaily reports. The observation is described as a breakthrough that could help physicists uncover hidden particles and forces beyond the reach of today's most powerful accelerators. The item does not name the particle involved, the experiment that made the observation, or the statistical significance of the result. Rare decays are a standard tool in particle physics: because they are so uncommon, any deviation from predicted rates can point to new physics. The finding adds to the case for further precision measurements and for upgrades to accelerator and detector facilities.

Why it matters：Rare-decay measurements are among the few practical routes to physics beyond the Standard Model, so a confirmed observation shapes the priorities of particle physics experiments worldwide.

Key points

  • The decay occurs about once in 10 billion decays.
  • The search lasted more than 40 years.
  • Researchers say it could reveal particles and forces beyond current accelerators.

Sources (original reporting)

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