A key constant’s new measurement hints ‘dark photons’ don’t exist
This is the most precise look yet at the fine-structure constant
![Weicheng Zhong](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/04/041118_EC_fine-structure-constant_feat.jpg?fit=860%2C460&ssl=1)
CONSTANT QUANTIFED A team of physicists, including Weicheng Zhong of the University of California, Berkeley (pictured) has performed the most precise measurement yet of the fine-structure constant, which governs the strength of electromagnetic interactions.
Chenghui Yu