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arXiv 2008.02049hep-phhep-exhep-lat
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轴矢量四夸克$T_{bb;\overline{u} \overline{d}}^{-}$的半轻子和非轻子衰变

Semileptonic and nonleptonic decays of the axial-vector tetraquark $T_{bb;\overline{u} \overline{d}}^{-}$

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

摘要:

用QCD求和规则方法研究了双美轴矢量四夸克态$T_{bb;\overline{u} \overline{d}}^{-}$到态$\widetilde{T}_{bc; \overline{u}\overline{d}}^{0}$(以下分别为$T_{bb}^{-}$和$\widetilde{T} _{bc}^{0}$)的半轻子和非轻子衰变.末态四夸克态$\widetilde{T}_{bc}^{0}$被看作是由重轴矢量双夸克态$ b^{T}γ_{μ}Cc$和轻标量反双夸克态$\overline{u}Cγ_{5} \overline{d}^{T}$构成的轴矢量粒子。它的光谱参数计算使用两点求和规则,考虑到夸克,胶子和混合凝聚的贡献,直到PDMATHAMT维。本文研究了占优势的半轻子$T_{bb}^{-} \to \widetilde{T}_{bc}^{0}l\overline{ν}_{l}$和非轻子衰变$T_{bb}^{-} \to \widetilde{T}_{bc}^{0}M$,其中$M$是赝标介子$π^{-}, K^{-}, D^{-}$和$D_s^{-}$之一.这些过程的部分宽度计算的弱形状因子$G_{i}(q^2),\ i=1,2,3,4$,采用QCD三点求和规则的方法提取。所考虑的衰变的部分宽度的预测,以提高四夸克$T_{bb}^{-}$,这是重要的实验探索这种奇异介子的全宽度和寿命的理论预测的准确性。

英文摘要:

The semileptonic and nonleptonic decays of the double-beauty axial-vector tetraquark $T_{bb;\overline{u} \overline{d}}^{-}$ to a state $\widetilde{T}_{bc; \overline{u}\overline{d}}^{0}$ (hereafter $T_{bb}^{-}$ and $\widetilde{T} _{bc}^{0}$, respectively) are investigated in the context of the QCD sum rule method. The final-state tetraquark $\widetilde{T}_{bc}^{0}$ is treated as an axial-vector particle built of a heavy axial-vector diquark $ b^{T}γ_{μ}Cc$ and light scalar antidiquark $\overline{u}Cγ_{5} \overline{d}^{T}$. Its spectroscopic parameters are calculated using the two-points sum rules by taking into account contributions of quark, gluon and mixed condensates up to dimension $10$. We study the dominant semileptonic $T_{bb}^{-} \to \widetilde{T}_{bc}^{0}l\overline{ν}_{l}$ and nonleptonic decays $T_{bb}^{-} \to \widetilde{T}_{bc}^{0}M$, where $M$ is one of the pseudoscalar mesons $π^{-}, K^{-}, D^{-}$ and $D_s^{-}$. The partial widths of these processes are computed in terms of weak form factors $G_{i}(q^2),\ i=1,2,3,4$, extracted by employing the QCD three-point sum rule approach. Predictions obtained for partial widths of considered decays are used to improve accuracy of theoretical predictions for full width and lifetime of the tetraquark $T_{bb}^{-}$, which are important for experimental exploration of this exotic meson.

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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