Exclusive Leptonium Electroproduction

Hao-ye Deng, Qi-Ming Feng, Qi-Wei Hu +8

Purely leptonic bound states provide precision probes of QED. Positronium $(e^{+}{e}^{-})$ and muonium $({\mu }^{+}{e}^{-})$ have long been observed, whereas dimuonium $({\mu }^{+}{\mu }^{-})$ and tauonium $(τ^+…