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arXiv 1707.00565hep-phhep-ex
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类底偶素$Z_b$共振的混合模型

A mixing model for bottomoniumlike $Z_b$ resonances

M. B. Voloshin

摘要:

等矢量底偶素类奇异共振$Z_b(10610)$和$Z_b(10650)$非常接近重介子对$B \bar B^* \, ( \bar B B^*)$和$B^* \bar B^*$的阈值,自然被理解为由相应的介子-反介子对构成的“分子”态。两个通道完全分离的图像不可能是精确的,并且状态之间的交叉馈送必然发生。一个简单的模型被认为是在这里描述的通道之间的混合的一个参数。该模型合理地描述了目前的数据$Z_b$共振衰变到底鎓加π介子和预测的速度和一个独特的干涉图案的衰变$Z_b(10650) \to B \bar B^* \, ( \bar B B^*)$以及过剩的质量分裂之间的质量差的$B^*$和$B$介子的共振。

英文摘要:

The isovector bottomoniumlike exotic resonances $Z_b(10610)$ and $Z_b(10650)$ are very close to the thresholds of heavy meson pairs $B \bar B^* \, ( \bar B B^*)$ and $B^* \bar B^*$, and are naturally understood as `molecular' states made of the corresponding meson-antimeson pairs. The picture with a full separation of the two channels cannot be exact and a cross-feed between the states necessarily takes place. A simple model is considered here describing the mixing between the channels in terms of one parameter. The model reasonably describes the current data on the decays of the $Z_b$ resonances to bottomonium plus a pion and predicts the rate and a distinctive interference pattern for the decay $Z_b(10650) \to B \bar B^* \, ( \bar B B^*)$ as well as excess of the mass splitting between the resonances over the mass difference between $B^*$ and $B$ mesons.

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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