J/psi decays can produce ortho-dimuonium at a branching fraction of about 1.5e-12, while Upsilon decays allow tauonium production, with several channels potentially observable at planned facilities.
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Production of leptonium in heavy quarkonium decays
J/psi decays can produce ortho-dimuonium at a branching fraction of about 1.5e-12, while Upsilon decays allow tauonium production, with several channels potentially observable at planned facilities.