Chinese President Xi Jinping’s visit to Washington is an excellent opportunity to recognize China’s scientific contributions to the global community, and to foster more cooperation between the U.S. and China in many areas of science, especially particle physics.

The discovery of the Higgs particle at Europe’s Large Hadron Collider in 2012 began a new era. It confirmed an essential feature of the 40-year-old Standard Model of particle physics, a missing ingredient that was needed to make the whole structure work. But the discovery...