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arXiv 0903.5540hep-ph
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Y（4140）窄结构的QCD求和规则计算

A QCD sum rule calculation for the Y(4140) narrow structure

Raphael M. Albuquerque, Mirian E. Bracco, Marina Nielsen

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7 pages, 4 eps figures
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摘要：

我们使用QCD求和规则来计算耦合到分子$D_{s}^{*}\bar{D}_s^{*}$电流的可能标量介子态的质量。我们发现了一个质量为$m_{D_s^*D_s^*}=(4.14\pm 0.09)$ GeV的能级，它与最近观测到的Y（4140）粲偶素态非常吻合。我们考虑了八维凝聚的贡献，我们在$α_s$中工作在领先的顺序，我们保持在奇怪的夸克质量$m_s$中的线性项。我们还考虑了分子$D^{*}\bar{D}^{*}$电流，我们得到$m_{D^*{D}^*}=(4.13\pm 0.10)$，约200 MeV以上的Y（3930）粲偶素状态的质量。我们认为Y（4140）结构可以用$D_s^*\bar{D}_s^*$分子态来描述。

英文摘要：

We use the QCD sum rules to evaluate the mass of a possible scalar mesonic state that couples to a molecular $D_{s}^{*}\bar{D}_s^{*}$ current. We find a mass $m_{D_s^*D_s^*}=(4.14\pm 0.09)$ GeV, which is in a excellent agreement with the recently observed Y(4140) charmonium state. We consider the contributions of condensates up to dimension eight, we work at leading order in $α_s$ and we keep terms which are linear in the strange quark mass $m_s$. We also consider a molecular $D^{*}\bar{D}^{*}$ current and we obtain $m_{D^*{D}^*}=(4.13\pm 0.10)$, around 200 MeV above the mass of the Y(3930) charmonium state. We conclude that it is possible to describe the Y(4140) structure as a $D_s^*\bar{D}_s^*$ molecular state.

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