Search for Charged Lepton Flavor Violation at BESIII
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866917203398361088 |
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| author | Yuan, MingKuan Song, TianZi You, ZhengYun |
| author_facet | Yuan, MingKuan Song, TianZi You, ZhengYun |
| contents | Charged lepton flavor violation (CLFV) is forbidden in the Standard Model but predicted by many new physics models. We present searches for CLFV in charmonium decays using world-leading datasets collected by the BESIII detector. The processes $J/ψ\to eτ$, $J/ψ\to eμ$, and $ψ(3686)\to eμ$ are investigated using world-leading $J/ψ$ and $ψ(3686)$ dataset collected by BESIII. No significant signals are observed, and upper limits on branching fractions are set at $\mathcal{B}(J/ψ\to eτ)<7.5\times10^{-8}$, $\mathcal{B}(J/ψ\to eμ)<4.5\times10^{-9}$, and $\mathcal{B}(ψ(3686)\to eμ)<1.4\times10^{-8}$ at 90\% confidence level. These results provide constraints on Wilson coefficients in effective field theory and probe new physics at high energy scales. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_09249 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Search for Charged Lepton Flavor Violation at BESIII Yuan, MingKuan Song, TianZi You, ZhengYun High Energy Physics - Experiment Charged lepton flavor violation (CLFV) is forbidden in the Standard Model but predicted by many new physics models. We present searches for CLFV in charmonium decays using world-leading datasets collected by the BESIII detector. The processes $J/ψ\to eτ$, $J/ψ\to eμ$, and $ψ(3686)\to eμ$ are investigated using world-leading $J/ψ$ and $ψ(3686)$ dataset collected by BESIII. No significant signals are observed, and upper limits on branching fractions are set at $\mathcal{B}(J/ψ\to eτ)<7.5\times10^{-8}$, $\mathcal{B}(J/ψ\to eμ)<4.5\times10^{-9}$, and $\mathcal{B}(ψ(3686)\to eμ)<1.4\times10^{-8}$ at 90\% confidence level. These results provide constraints on Wilson coefficients in effective field theory and probe new physics at high energy scales. |
| title | Search for Charged Lepton Flavor Violation at BESIII |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.09249 |