Physicists appear to have resolved the 15-year proton size puzzle through new experimental measurements published in Nature and Physical Review Letters. The findings favor a smaller proton radius and suggest no new physics beyond standard models is required. This represents a significant resolution to a longstanding debate in quantum physics.
Background
The proton radius puzzle emerged from conflicting measurements of hydrogen's proton charge radius over the past 15 years, with some results suggesting it was smaller than predicted by standard models.
- Source
- Ars Technica
- Published
- Apr 15, 2026 at 12:52 AM
- Score
- 8.0 / 10