When positrons and electrons meet, annihilation occurs.
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culture
正负电子对撞机 (BEPC, Beijing Electron-Positron Collider) was the first major high-energy physics machine in China, operational from 1989 at the Institute of High Energy Physics (中科院高能所). Its data on the τ lepton mass remains one of the most cited Chinese physics results.
memory
正 (positive) + 负 (negative) + 电子 (electron). 正电子 alone = positron; 负电子 alone = (negatively charged) electron. Pairing them as 正负电子 means 'both kinds together'.
