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| Format: | Preprint |
| Veröffentlicht: |
2026
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| Online-Zugang: | https://arxiv.org/abs/2602.19165 |
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| _version_ | 1866910029255278592 |
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| author | Nakamura, Satoshi X. |
| author_facet | Nakamura, Satoshi X. |
| contents | Recently, LHCb reported the radiative-decay ratio ${\cal R}^{ψγ}\equiv {\cal B}[X(3872)\to ψ'γ]/{\cal B}[X(3872)\to J/ψγ]=1.67\pm 0.25$ extracted from $B^+\to K^+(J/ψγ, ψ'γ)$. This result differs markedly ($\sim4.6σ$) from the BESIII value obtained from $e^+e^-\to γ(J/ψγ, ψ'γ)$, ${\cal R}^{ψγ}=-0.04\pm 0.28$. Such a significant tension suggests that more than one state in the $X(3872)$ region contributes to the processes. We therefore propose a two-state scenario: a shallow $D^{*0}\bar{D}^0$ bound state with $J^{PC}=1^{++}$ and a $2^{-+}$ charmonium candidate, $η_{c2}$, slightly above the $D^{*0}\bar{D}^0$ threshold. We show that this hypothesis consistently describes these ratios along with other branching fractions and lineshapes across multiple processes. By contrast, fits without the $η_{c2}$ component fail to reproduce the radiative-ratio data. We also predict helicity-angle distributions that motivates the future experiments to test the two-state hypothesis and search for the so-far missing $η_{c2}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_19165 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Two nearby states in the $X(3872)$ region: Resolving the radiative-decay ratio tension with $η_{c2}$ Nakamura, Satoshi X. High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory Recently, LHCb reported the radiative-decay ratio ${\cal R}^{ψγ}\equiv {\cal B}[X(3872)\to ψ'γ]/{\cal B}[X(3872)\to J/ψγ]=1.67\pm 0.25$ extracted from $B^+\to K^+(J/ψγ, ψ'γ)$. This result differs markedly ($\sim4.6σ$) from the BESIII value obtained from $e^+e^-\to γ(J/ψγ, ψ'γ)$, ${\cal R}^{ψγ}=-0.04\pm 0.28$. Such a significant tension suggests that more than one state in the $X(3872)$ region contributes to the processes. We therefore propose a two-state scenario: a shallow $D^{*0}\bar{D}^0$ bound state with $J^{PC}=1^{++}$ and a $2^{-+}$ charmonium candidate, $η_{c2}$, slightly above the $D^{*0}\bar{D}^0$ threshold. We show that this hypothesis consistently describes these ratios along with other branching fractions and lineshapes across multiple processes. By contrast, fits without the $η_{c2}$ component fail to reproduce the radiative-ratio data. We also predict helicity-angle distributions that motivates the future experiments to test the two-state hypothesis and search for the so-far missing $η_{c2}$. |
| title | Two nearby states in the $X(3872)$ region: Resolving the radiative-decay ratio tension with $η_{c2}$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2602.19165 |