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arXiv 1603.02249hep-ph
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$X^\pm(5568) \to B_{s}^0π^\pm$衰变宽度的QCD求和规则计算

A QCD sum rule calculation of the $X^\pm(5568) \to B_{s}^0π^\pm$ decay width

J. M. Dias, K. P. Khemchandani, A. Martínez Torres, M. Nielsen, C. M. Zanetti

摘要:

为了理解最近由D 0合作组在$B_{s}^0π^\pm$系统的质谱中观测到的$X(5568)$的性质,我们在以前的工作中用两点QCD求和规则方法研究了它的标量四夸克(双夸克-反双夸克)结构.其质量计算结果与实验值符合得很好。受这一发现的鼓舞,我们现在利用三点QCD求和规则扩展我们的计算,得到$X(5568)$到$B_{s}^0π^\pm$的衰变宽度。我们得到了一个$(20.4\pm8.7)\MeV$值,与实验值相比,加强了$21.9\pm6.4 (\mbox{sta})^{+5.0}_{-2.5}(\mbox{syst}) \MeV/c^2$的标量四夸克性质。

英文摘要:

To understand the nature of the $X(5568)$, recently observed in the mass spectrum of the $B_{s}^0π^\pm$ system by the D0 Collaboration, we have investigated, in a previous work, a scalar tetraquark (diquak-antidiquark) structure for it, within the two-point QCD sum rules method. The result found for its mass agrees well with the experimental value. Encouraged by this finding we now extend our calculations to obtain the decay width of $X(5568)$ to $B_{s}^0π^\pm$ using the three-point QCD sum rule. We obtain a value of $(20.4\pm8.7)\MeV$, which, on comparing with the experimental value of $21.9\pm6.4 (\mbox{sta})^{+5.0}_{-2.5}(\mbox{syst}) \MeV/c^2$, reinforces the scalar four quark nature of $X(5568)$.

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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