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arXiv 2406.06759hep-phhep-exhep-lat
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赝标量与矢量四夸克态 $bb\overline{c}\overline{c}$

Pseudoscalar and vector tetraquarks $bb\overline{c}\overline{c}$

S. S. Agaev, K. Azizi, H. Sundu

AI总结:

本文基于QCD求和规则方法研究了赝标量与矢量四夸克态 $bb\overline{c}\overline{c}$,计算了其质量、流耦合及多个衰变道的全宽度,为四夸克共振分析提供了理论预测。

摘要:

在QCD求和规则方法的框架下,本文研究了赝标量与矢量四夸克态 $bb\overline{c}\overline{c}$。我们将 $T_{\mathrm{PS}}$ 和 $T_{\mathrm{V}}$ 分别建模为由双夸克 $b^{T}Cγ_{5}b$、$\overline{c}C\overline{c}^{T}$ 和 $b^{T}Cγ_{5}b$、$\overline{c}Cγ_μγ_{5}\overline{c}^{T}$ 构成的结构,其中 $C$ 为电荷共轭矩阵。利用QCD两点求和规则方法,计算了四夸克态 $T_{\mathrm{PS}}$ 和 $T_{\mathrm{V}}$ 的谱学参数,即它们的质量与流耦合常数。通过考虑运动学上允许的衰变道,我们评估了 $T_{\mathrm{PS}}$ 和 $T_{\mathrm{V}}$ 的全宽度。对于赝标量粒子,这些过程为 $T_{\mathrm{PS}} \to B_{c}^{-}B_{c}^{\ast -}$、$B_{c}^{-}B_{c}^{-}(1^{3}P_{0})$ 和 $B_{c}^{\ast -}B_{c}^{-}(1^{1}P_{1})$。矢量态 $T_{\mathrm{V}}$ 可解离为介子对 $2 B_{c}^{-}$、$2 B_{c}^{\ast -}$ 和 $B_{c}^{-}B_{c}^{-}(1^{1}P_{1})$。这些衰变的部分宽度由相应的四夸克态-介子-介子顶点处的强耦合决定,并在三点求和规则方法框架下进行了计算。对赝标量四夸克态质量 $m =(13.092\pm 0.095)~\mathrm{GeV}$、全宽度 $Γ_{\mathrm{PS}}=(63.7\pm 13.0)~\mathrm{MeV}$,以及矢量四夸克态质量 $\widetilde{m} =(13.15\pm 0.10)~ \mathrm{GeV}$、全宽度 $Γ_{\mathrm{V}}=(53.5\pm 10.3)~\mathrm{MeV}$ 的预测,有助于分析不同的四夸克态共振。

英文摘要:

The pseudoscalar and vector four-quark states $bb\overline{c}\overline{c}$ are studied in the context of the QCD sum rule method. We model $T_{\mathrm{ \ \ PS}} $ and $T_{\mathrm{V}}$ as structures built of diquarks $ b^{T}Cγ_{5}b$, $\overline{c}C\overline{c}^{T}$ and $b^{T}Cγ_{5}b$ , $\overline{c}Cγ_μγ_{5}\overline{c}^{T}$, respectively, with $ C$ being the charge conjugation matrix. The spectroscopic parameters of the tetraquarks $T_{\mathrm{PS}}$ and $T_{\mathrm{V}}$, i.e., their masses and current couplings are calculated using QCD two-point sum rule method. We evaluate the full widths of $T_{\mathrm{PS}}$ and $T_{\mathrm{V}}$ by taking into account their kinematically allowed decay channels. In the case of the pseudoscalar particle they are processes $T_{\mathrm{PS}} \to B_{c}^{-}B_{c}^{\ast -}$, $B_{c}^{-}B_{c}^{-}(1^{3}P_{0})$ and $B_{c}^{\ast -}B_{c}^{-}(1^{1}P_{1})$. The vector state $T_{\mathrm{V}}$ can dissociate to meson pairs $2 B_{c}^{-}$, $2 B_{c}^{\ast -}$ and $ B_{c}^{-}B_{c}^{-}(1^{1}P_{1})$. Partial widths of these decays are determined by the strong couplings at relevant tetraquark-meson-meson vertices, which evaluated in the context of the three-point sum rule approach. Predictions obtained for the mass and full width of the pseudoscalar $m =(13.092\pm 0.095)~\mathrm{GeV}$, $Γ_{\mathrm{PS} }=(63.7\pm 13.0)~\mathrm{MeV}$ and vector $\widetilde{m} =(13.15\pm 0.10)~ \mathrm{GeV}$, $Γ_{\mathrm{V}}=(53.5\pm 10.3)~\mathrm{MeV}$ tetraquarks can be useful for analyses of different four-quark resonances.

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