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arXiv 1105.4473hep-phhep-ex
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Z_b共振态中的重夸克自旋结构

Heavy quark spin structure in Z_b resonances

A. E. Bondar, A. Garmash, A. I. Milstein, R. Mizuk, M. B. Voloshin

摘要:

我们讨论了最近观察到的“孪生”共振$Z_b(10610)$和$Z_b(10650)$的重夸克自旋结构,假设它们大多是“分子”型的,即它们的内部动力学主要是由与介子对$B^* \bar B - B {\bar B}^*$和$B^* {\bar B}^*$的耦合所控制的。我们发现,在$Z_b(10610)$和$Z_b(10650)$共振的$b \bar b$对的状态是一个混合的自旋三重态和自旋单线态的振幅相等,并与两个共振之间的相位正交。这样的结构引起的可观察到的振幅,与最近获得的数据由贝尔之间的特定关系。我们还简要地讨论了新发现的共振的同位素单重态对应物的可能性质,以及它们的$C$($G$)宇称对立面可能存在于开放的$B$味阈值附近的相同质量范围内。

英文摘要:

We discuss the heavy quark spin structure of the recently observed `twin' resonances $Z_b(10610)$ and $Z_b(10650)$ assuming that these are mostly of a `molecular' type, i.e. that their internal dynamics is dominated by the coupling to meson pairs $B^* \bar B - B {\bar B}^*$ and $B^* {\bar B}^*$. We find that the state of the $b \bar b$ pair within the $Z_b(10610)$ and $Z_b(10650)$ resonances is a mixture of a spin-triplet and a spin-singlet of equal amplitude and with the phase orthogonal between the two resonances. Such a structure gives rise to specific relations between observable amplitudes that are in agreement with the data obtained recently by Belle. We also briefly discuss possible properties of the isotopically singlet counterparts of the newly found resonances, and also of their $C$ ($G$) parity opposites that likely exist in the same mass range near the open $B$ flavor threshold.

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