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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2604.10626 |
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| _version_ | 1866917401430327296 |
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| author | Agaev, S. S. Azizi, K. Sundu, H. |
| author_facet | Agaev, S. S. Azizi, K. Sundu, H. |
| contents | The resonance $X(6600)$ is explored as the all-charm tetraquark structure with spin-parities $J^{\mathrm{PC}}=2^{++}$. It is considered in the diquark-antidiquark picture and modeled as a tensor state $X$ composed of the axial-vector diquark $cCγ_μc$ and antidiquark $\overline{c}% γ_νC\overline{c}$ with $C$ being the charge conjugation matrix. The mass and decay width of $X$ are evaluated in the framework of QCD sum rule (SR) methods. The two-point SR approach is applied to find its spectroscopic parameters, while three-point SRs used to calculate partial widths of different decay channels of $X$. We study its leading decays $X \to J/ψJ/ψ$, $X \to η_{c}η_{c}$ and $χ_{c1}(1P)η_{c}$ in which all four $c$-quarks constitute final-state mesons. We consider also the subleading channels $X\to D_{(s)}^{(\ast )+}D_{(s)}^{(\ast )-}$ and $% D_{(s)}^{(\ast )0}\overline{D}_{(s)}^{(\ast )0}$ generated by annihilation of $\overline{c}c$ quarks in the tetraquark. Comparison of the mass $m=(6609 \pm 50)~ \mathrm{MeV}$ and width $Γ[X]=(165 \pm 23)~ \mathrm{MeV}$ of the tensor diquark-antidiquark state $X$ with experimental data allows us to interpret it as an essential component of the resonance $X(6600)$. We also provide a lower limit for the mass of the first radial excitation of $X$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10626 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Resonance $X(6600)$ Agaev, S. S. Azizi, K. Sundu, H. High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice The resonance $X(6600)$ is explored as the all-charm tetraquark structure with spin-parities $J^{\mathrm{PC}}=2^{++}$. It is considered in the diquark-antidiquark picture and modeled as a tensor state $X$ composed of the axial-vector diquark $cCγ_μc$ and antidiquark $\overline{c}% γ_νC\overline{c}$ with $C$ being the charge conjugation matrix. The mass and decay width of $X$ are evaluated in the framework of QCD sum rule (SR) methods. The two-point SR approach is applied to find its spectroscopic parameters, while three-point SRs used to calculate partial widths of different decay channels of $X$. We study its leading decays $X \to J/ψJ/ψ$, $X \to η_{c}η_{c}$ and $χ_{c1}(1P)η_{c}$ in which all four $c$-quarks constitute final-state mesons. We consider also the subleading channels $X\to D_{(s)}^{(\ast )+}D_{(s)}^{(\ast )-}$ and $% D_{(s)}^{(\ast )0}\overline{D}_{(s)}^{(\ast )0}$ generated by annihilation of $\overline{c}c$ quarks in the tetraquark. Comparison of the mass $m=(6609 \pm 50)~ \mathrm{MeV}$ and width $Γ[X]=(165 \pm 23)~ \mathrm{MeV}$ of the tensor diquark-antidiquark state $X$ with experimental data allows us to interpret it as an essential component of the resonance $X(6600)$. We also provide a lower limit for the mass of the first radial excitation of $X$. |
| title | Resonance $X(6600)$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2604.10626 |