Production of leptonium in heavy quarkonium decays
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914010181402624 |
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| author | Zhao, Yuhan Jiang, Jun |
| author_facet | Zhao, Yuhan Jiang, Jun |
| contents | Lepton pairs with opposite charges can form bound states known as ``leptonium'' through quantum electrodynamic interactions. Heavy quarkonia such as $J/ψ$ are abundantly produced at facilities like BESIII and the future Super Tau-Charm Facility (STCF). In this work, we investigate leptonium production in heavy quarkonium decays, specifically focusing on the processes ${\cal{Q}} \longrightarrow (l_1^+ l_2^-)[n] +γ$ ($l_{1,2}= τ,\, μ,\, e$) and ${\cal{Q}} \longrightarrow (l_1^+ l_2^-)[n] + l_1^- l_2^+$. Here, ${\cal{Q}}$ denotes the heavy quarkonium $J/ψ$ or $Υ$, while $n=$ ${^1S_0}$ or $^3S_1$ corresponds to para-leptonium and ortho-leptonium, respectively. With an annual production of $3.4 \times 10^{12}$ $J/ψ$ events at STCF, there is significant potential to observe positronium $(e^+e^-)$, muonium $(μ^+e^-)$, and dimuonium $(μ^+μ^-)$. In particular, the ortho-dimuonium $(μ^+μ^-)[^3S_1]$ may be discovered at the future STCF, with an inclusive branching fraction of $Br(J/ψ\longrightarrow (μ^+μ^-)[^3S_1] +X) = 1.5 \times 10^{-12}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_02676 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Production of leptonium in heavy quarkonium decays Zhao, Yuhan Jiang, Jun High Energy Physics - Phenomenology Lepton pairs with opposite charges can form bound states known as ``leptonium'' through quantum electrodynamic interactions. Heavy quarkonia such as $J/ψ$ are abundantly produced at facilities like BESIII and the future Super Tau-Charm Facility (STCF). In this work, we investigate leptonium production in heavy quarkonium decays, specifically focusing on the processes ${\cal{Q}} \longrightarrow (l_1^+ l_2^-)[n] +γ$ ($l_{1,2}= τ,\, μ,\, e$) and ${\cal{Q}} \longrightarrow (l_1^+ l_2^-)[n] + l_1^- l_2^+$. Here, ${\cal{Q}}$ denotes the heavy quarkonium $J/ψ$ or $Υ$, while $n=$ ${^1S_0}$ or $^3S_1$ corresponds to para-leptonium and ortho-leptonium, respectively. With an annual production of $3.4 \times 10^{12}$ $J/ψ$ events at STCF, there is significant potential to observe positronium $(e^+e^-)$, muonium $(μ^+e^-)$, and dimuonium $(μ^+μ^-)$. In particular, the ortho-dimuonium $(μ^+μ^-)[^3S_1]$ may be discovered at the future STCF, with an inclusive branching fraction of $Br(J/ψ\longrightarrow (μ^+μ^-)[^3S_1] +X) = 1.5 \times 10^{-12}$. |
| title | Production of leptonium in heavy quarkonium decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.02676 |