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arXiv 0705.1357hep-ph
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QCD求和规则支持四夸克态吗?

Do the QCD sum rules support four-quark states?

R. D. Matheus, F. S. Navarra, M. Nielsen, R. Rodrigues da Silva

摘要:

我们检验了QCD求和规则应用于轻标量介子、粲介子$D_{s0}(2317)$和$D_{s1} (2460)$以及X(3872)轴介子的有效性。我们发现,与所研究的电流,有可能找到一个可接受的Borel窗口只为X(3872)介子。在这样的Borel窗口中,我们有很好的OPE收敛性和比连续贡献更大的极点贡献。我们解释这些结果作为一个强有力的论据,反对分配的四夸克结构的轻标量和$D_{s0}(2317)$和$D_{s1} (2460)$介子。

英文摘要:

We test the validity of the QCD sum rules applied to the light scalar mesons, the charmed mesons $D_{s0}(2317)$ and $D_{s1} (2460)$, and the X(3872) axial meson, considered as tetraquark states. We find that, with the studied currents, it is possible to find an acceptable Borel window only for the X(3872) meson. In such a Borel window we have simultaneouly a good OPE convergence and a pole contribution which is bigger than the continuum contribution. We interpret these results as a strong argument against the assignment of a tetraquark structure for the light scalars and the $D_{s0}(2317)$ and $D_{s1} (2460)$ mesons.

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