 Beijing Electron–Positron Collider II

The Beijing Electron–Positron Collider II (BEPC II) is a high-energy particle collider located in Beijing, China. It is an upgrade of the original Beijing Electron–Positron Collider (BEPC), which began operation in the 1980s. BEPC II was commissioned in 2008 and is designed to primarily study electron-positron collisions, providing insights into various areas of particle physics, including particle interactions and the properties of heavy quarks.