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arXiv 1608.04785hep-ph
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共振态$X(5568)$的奇异轴矢量态

Resonance $X(5568)$ as an exotic axial-vector state

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

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10 Pages, 5 Figures and 1 Table
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摘要：

通过将奇异的$X(5568)$共振模型化为量子数为$J^{P}=1^{+}$的双夸克-反双夸克态$% X_b=[su][bd]$，计算了共振态$X(5568)$的质量和介子-电流耦合常数以及衰变宽度$X(5568)\to B_s^{\ast}π$.计算采用QCD两点求和规则方法，考虑了八维以下的夸克、胶子和混合真空凝聚。利用软介子近似下的光锥求和规则方法，研究了顶点$X_bB_{s}^{\ast}π$，提取了强耦合$% g_{X_bB_{s}^{\ast}π}$，这是计算$X_b \to B_s^{\ast}π^{+}$衰变过程宽度的必要条件.所得到的预测进行了比较与D 0合作的实验数据，和其他理论工作的结果。

英文摘要：

The mass and meson-current coupling constant of the resonance $X(5568)$, as well as the width of the decay $X(5568)\to B_s^{\ast}π$ are calculated by modeling the exotic $X(5568)$ resonance as a diquark-antidiquark state $% X_b=[su][bd]$ with quantum numbers $J^{P}=1^{+}$. The calculations are made employing QCD two-point sum rule method, where the quark, gluon and mixed vacuum condensates up to dimension eight are taken into account. The sum rule approach on the light-cone in its soft-meson approximation is used to explore the vertex $X_bB_{s}^{\ast}π$ and extract the strong coupling $% g_{X_bB_{s}^{\ast}π}$, which is a necessary ingredient to find the width of the $X_b \to B_s^{\ast}π^{+}$ decay process. The obtained predictions are compared with the experimental data of the D0 Collaboration, and results of other theoretical works.

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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