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arXiv 2410.00575hep-phhep-exhep-lat
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隐粲底结构$bc\overline{b}\overline{c}$:轴矢量情形

Hidden charm-bottom structures $bc\overline{b}\overline{c}$: Axial-vector case

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

AI总结:

本研究在QCD求和规则框架下,将含$bc\overline{b}\overline{c}$的隐粲底轴矢量结构$T$视为双夸克-反双夸克态,计算其质量与宽度,为全重共振态的实验研究提供参考。

摘要:

在QCD求和规则框架下,计算了含$bc\overline{b}\overline{c}$夸克的隐粲底轴矢量结构$T$的质量和宽度。该结构被视为由标量双夸克与轴矢量反双夸克组分构成的双夸克-反双夸克态。研究采用两点求和规则方法计算$T$的质量,通过考虑八种衰变模式评估该粒子的宽度:衰变到$η_{b}J/ψ$、$η_{c}Υ(1S)$、$B_{c}^{-}B_{c}^{\ast +}$和$B_{c}^{+}B_{c}^{\ast -}$属于解离过程,初始态的所有夸克均分布在末态粒子中;衰变到带适当电荷和自旋宇称的$DD$和$BB$介子的过程,是由$T$中的$b\overline{b}$和$c\overline{c}$夸克湮灭产生的衰变道。所有这些过程的分宽度均通过三点求和规则方法获得,该方法是确定相关四夸克-介子-介子顶点处强耦合所必需的。我们得到的四夸克$T$的质量$m=(12715\pm 90)\\ \mathrm{MeV}$、宽度$Γ[T] =(140 \pm 13)\\ \mathrm{MeV}$,以及本文探究的众多衰变道,对当前和未来的全重共振态实验研究具有参考价值。

英文摘要:

Mass and width of a hidden charm-bottom axial-vector structure $T$ containing $bc \overline{b}\overline{c}$ quarks are calculated in QCD sum rule framework. It is treated as a diquark-antidiquark state built of scalar diquark and axial-vector antidiquark components. The mass of $T$ is computed using the two-point sum rule method. The width of this particle is evaluated by considering eight decay modes: The decays to $η_{b}J/ψ$, $η_{c}Υ(1S)$, $B_{c}^{-}B_{c}^{\ast +}$, and $B_{c}^{+}B_{c}^{\ast -}$ are dissociation processes, in which all initial quarks are distributed between the final-state particles. The decays to $DD$ and $BB$ mesons with appropriate charges and spin-parities are channels generated due to the annihilations of $b\overline{b}$ and $c\overline{c}$ quarks from $T$. Partial widths for all of these processes are obtained by employing the three-point sum rule approach necessary to find the strong couplings at relevant tetraquark-meson-meson vertices. Our results for the mass $ m=(12715\pm 90)~\mathrm{MeV}$ and width $Γ[T] =(140 \pm 13)~ \mathrm{MeV }$ of the tetraquark $T$, as well as its numerous decay channels explored in this article are useful for ongoing and future experimental investigations of fully heavy resonances.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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