# After 40 years, CERN finds evidence of a one-in-10-billion particle decay

Source: [Matter & Energy News -- ScienceDaily](https://www.sciencedaily.com/releases/2026/11/261108233047.htm) · 2026-11-10 · Physics
Page: https://themorning.science/story/after-40-years-cern-finds-evidence-of-a-one-in-10-billion-particle-decay-aa5ff3ce791baa85
Kind: research · Impact: medium

## In brief

- CERN scientists report evidence of a particle decay so rare it occurs roughly once in 10 billion decays.
- The finding ends a search that spanned more than 40 years.
- The result could help physicists uncover hidden particles and forces beyond current reach.

## Why it matters

Rare decays can reveal particles and forces not yet accounted for by current theory, which could guide future experiments in fundamental physics.

## Coverage

- [After 40 years, CERN finds evidence of a one-in-10-billion particle decay](https://www.sciencedaily.com/releases/2026/11/261108233047.htm) — Matter & Energy News -- ScienceDaily, 2026-11-10

Tags: particle physics, cern, rare decay, fundamental physics, hidden particles

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Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science