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arXiv 1006.0467hep-ph
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X(3872)作为QCD求和规则下的分子-粲偶素混合态的辐射衰变

Radiative decay of the X(3872) as a mixed molecule-charmonium state in QCD Sum Rules

M. Nielsen, C. M. Zanetti

摘要:

我们用QCD求和规则计算了介子X(3872)的辐射衰变宽度,假设X(3872)是粲偶素和具有$J^{PC}=1^{++}$的奇异分子$[c\bar{q}][q\bar{c}]$态的混合物。我们发现在混合角$5^0\leqθ\leq13^0$的小范围内,我们得到的分支比$Γ(X\to J/ψγ)/Γ(X\to J/ψπ^+π^-)=0.19\pm0.13$与实验值一致。该结果与以相同方法进行的模式$J/ψ(nπ)$的质量和衰减宽度的分析是相容的。

英文摘要:

We use QCD sum rules to calculate the width of the radiative decay of the meson X(3872), assumed to be a mixture between charmonium and exotic molecular $[c\bar{q}][q\bar{c}]$ states with $J^{PC}=1^{++}$. We find that in a small range for the values of the mixing angle, $5^0\leqθ\leq13^0$, we get the branching ratio $Γ(X\to J/ψγ)/Γ(X\to J/ψπ^+π^-)=0.19\pm0.13$, which is in agreement, with the experimental value. This result is compatible with the analysis of the mass and decay width of the mode $J/ψ(nπ)$ performed in the same approach.

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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