The proton’s weak side is just as feeble as physicists thought
Scientists make the most precise measurement yet of the particle’s weak charge
![Q-weak experiment](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/05/050818_EC_proton-brief_feat.jpg?fit=860%2C460&ssl=1)
WEAKEST LINK A property of the proton is getting an update, thanks to an ultraprecise measurement of the particle’s weak charge by the Q-weak experiment (shown).
Jefferson Lab/DOE