The weak charge of the proton has been measured to high precision, for the first time, by the Q-weak experiment at the Department of Energy’s Thomas Jefferson National Accelerator Facility (Jefferson Lab).  UVa Associate Professor of Physics Kent Paschke played a leading role in this experiment. Another faculty member, Gordon Cates, was also involved.

Xiaochao Zheng wrote an accompanying News and Views article.  [She donated the $130 honorarium to SPS.]

For further reading please see:

https://www.nature.com/articles/s41586-018-0096-0

and the News and Views article:

https://www.nature.com/articles/d41586-018-05037-9