Preprint
Aug 2026
Exclusive Leptonium Electroproduction
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 $(\tau^+\tau^-)$ remain undiscovered. We study exclusive vector-leptonium electroproduction in $ep$ collisions within nonrelativistic QED....
Hao K. Deng, Qi-Ming Feng, Qi-Wei Hu et al.
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