Observation of the decay $η_c\toγγ$ at BESIII
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866918179139223552 |
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| author | Li, Zhijun You, Zhengyun |
| author_facet | Li, Zhijun You, Zhengyun |
| contents | In the decays of $η_c\toγγ$ and $J/ψ\toγη_c$, there are discrepancies between the theoretical calculations and the PDG experimental values, referred to as the charmonium QCD puzzle. We observe the decay $η_c\toγγ$ in $J/ψ\toγη_c$ using $(2712.4\pm14.3)\times10^{6}$ $ψ(3686)$ events collected with the BESIII detector, and determine the product branching fraction $\mathcal{B}(J/ψ\toγη_c)\times\mathcal{B}(η_c\toγγ)=(5.23\pm0.26_{\rm{stat.}}\pm0.30_{\rm{syst.}})\times10^{-6}$. This measurement is consistent with the two most recent lattice QCD calculations, providing significant input toward resolving the charmonium QCD puzzle. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_26434 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of the decay $η_c\toγγ$ at BESIII Li, Zhijun You, Zhengyun High Energy Physics - Experiment In the decays of $η_c\toγγ$ and $J/ψ\toγη_c$, there are discrepancies between the theoretical calculations and the PDG experimental values, referred to as the charmonium QCD puzzle. We observe the decay $η_c\toγγ$ in $J/ψ\toγη_c$ using $(2712.4\pm14.3)\times10^{6}$ $ψ(3686)$ events collected with the BESIII detector, and determine the product branching fraction $\mathcal{B}(J/ψ\toγη_c)\times\mathcal{B}(η_c\toγγ)=(5.23\pm0.26_{\rm{stat.}}\pm0.30_{\rm{syst.}})\times10^{-6}$. This measurement is consistent with the two most recent lattice QCD calculations, providing significant input toward resolving the charmonium QCD puzzle. |
| title | Observation of the decay $η_c\toγγ$ at BESIII |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2510.26434 |