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arXiv 0907.3043hep-ph
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Y(3940)、Z(3930)和X(4160)是从矢量-矢量相互作用动态生成的共振

The Y(3940), Z(3930) and the X(4160) as dynamically generated resonances from the vector-vector interaction

R. Molina, E. Oset

摘要:

在隐规范理论框架下,研究了4000 MeV附近量子数为C=0,奇异数S=0的通道的矢量-矢量相互作用.通过在复平面上寻找极点,我们发现了三个可以用质量、宽度和量子数来识别的共振态,它们分别对应于Y(3940)、Z(3940)和X(4160),这些极点分别对应于同位旋I=0和J^{PC}=0^{++}、2^{++}和2^{++}。Y(3940)和Z(3940)与D^* \bar{D}^*的耦合更强,而X(4160)基本上是D^*_s \bar{D}^*_s分子态。另外两个额外的共振出现在我们的方法中,I=0,1和J^{PC}=1^{+-},2^{++},这是没有发现的PDG中的质量分别为M=3945,3912 MeV和宽度为Γ=0,120 MeV。

英文摘要:

We study the vector-vector interaction within the framework of the hidden gauge formalism for the channels with quantum numbers Charm C=0 and Strangeness S=0 in the energy region around 4000 MeV. By looking for poles in the complex plane we find three resonances that could be identified by the mass, width and quantum numbers with the Y(3940), Z(3940) and X(4160), these poles appear with isospin I=0 and J^{PC}=0^{++}, 2^{++} and 2^{++} respectively. Whereas the Y(3940) and Z(3940) are coupled more strongly to D^*\bar{D}^*, the X(4160) is basically a D^*_s \bar{D}^*_s molecular state. Another two extra resonances appear in our approach with I=0, 1 and J^{PC}=1^{+-}, 2^{++} which are not found in the PDG with masses M=3945, 3912 MeV and widths Γ=0, 120 MeV respectively.

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