Light hadronic decays of spin-0 partner of $X(3872)$
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911088363175936 |
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| author | Gao, Hong-Shuo Cai, Zu-Xin Li, Gang Liu, Shi-Dong |
| author_facet | Gao, Hong-Shuo Cai, Zu-Xin Li, Gang Liu, Shi-Dong |
| contents | The $X(3872)$ is theoretically predicted to have a spin-0 partner state denoted as $X_0$. Assuming the $X_0$ as a $D\bar{D}$ molecular bound state, we calculate the decay widths of $X_0\to VV$ and $X_0 \to PP$ ($V$ and $P$ stand for light vector and pseudoscalar mesons, respectively) via intermediate charmed meson loops. Three different configurations of the $X_0$, i.e., pure neutral components ($θ= 0$), isospin singlet ($θ= π/4$) and pure charged components ($θ= π/2$), are investigated. Within a commonly accepted range of the model parameter $α$, the predicted decay widths of $X_0 \to VV$ are on the order of a few hundred $\mathrm{keV}$, while the decay widths of $X_0 \to PP$ can reach several $\mathrm{MeV}$. The $X_0 \to ρρ$ and $ππ$ have larger decay rates. The relative width ratios between the channels are nearly model-independent. Moreover, among those channels only with isovector or isoscalar mesons, the relevant ratios are also independent of the phase angle. The predicted ratios are helpful for searching the $X_0$ in the future experiments at BESIII and Belle II. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_01536 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Light hadronic decays of spin-0 partner of $X(3872)$ Gao, Hong-Shuo Cai, Zu-Xin Li, Gang Liu, Shi-Dong High Energy Physics - Phenomenology The $X(3872)$ is theoretically predicted to have a spin-0 partner state denoted as $X_0$. Assuming the $X_0$ as a $D\bar{D}$ molecular bound state, we calculate the decay widths of $X_0\to VV$ and $X_0 \to PP$ ($V$ and $P$ stand for light vector and pseudoscalar mesons, respectively) via intermediate charmed meson loops. Three different configurations of the $X_0$, i.e., pure neutral components ($θ= 0$), isospin singlet ($θ= π/4$) and pure charged components ($θ= π/2$), are investigated. Within a commonly accepted range of the model parameter $α$, the predicted decay widths of $X_0 \to VV$ are on the order of a few hundred $\mathrm{keV}$, while the decay widths of $X_0 \to PP$ can reach several $\mathrm{MeV}$. The $X_0 \to ρρ$ and $ππ$ have larger decay rates. The relative width ratios between the channels are nearly model-independent. Moreover, among those channels only with isovector or isoscalar mesons, the relevant ratios are also independent of the phase angle. The predicted ratios are helpful for searching the $X_0$ in the future experiments at BESIII and Belle II. |
| title | Light hadronic decays of spin-0 partner of $X(3872)$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2508.01536 |