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arXiv 1902.09268hep-ph
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关于$Y(4260)$的起源

On the origin of the $Y(4260)$

Susana Coito, Francesco Giacosa

摘要:

我们研究之间的关系$ψ(4160)$和$Y(4260)$在一个单位化的有效拉格朗日方法。当$ψ(4160)\to D_s^*\bar{D}_s^*\to J/ψf_0(980)$类型的环驱动衰变通过与$ψ(4160)$对应的极接近\emph{almost}闭合$D_s^*\bar{D}_s^*$衰变通道而增强时,$Y(4260)$作为$ψ(4160)$的表现而出现。为简单起见,未包括可能通过相同机制增加不可忽略贡献的其他$f_0$共振,但预计它们不会改变主要结论。因此,在这幅图中,$Y(4260)$不是一个独立的共振,而是$ψ(4160)$的一个变体,这也解释了为什么在实验中OZI允许的衰变通道中看不到它。

英文摘要:

We study the relation between the $ψ(4160)$ and the $Y(4260)$ within an unitarized effective Lagrangian approach. The $Y(4260)$ arises as a manifestation of the $ψ(4160)$, when a loop-driven decay of the type $ψ(4160)\to D_s^*\bar{D}_s^*\to J/ψf_0(980)$ is enhanced by the proximity of the pole, corresponding to the $ψ(4160)$, to the \emph{almost} closed $D_s^*\bar{D}_s^*$ decay channel. Other $f_0$ resonances that may add a non-negligible contribution, by the same mechanism, are not included for simplicity, but they are not expected to change the main conclusion. Within this picture, the $Y(4260)$ is not, therefore, an independent resonance, but rather a variation of the $ψ(4160)$, which also explains why it is not seen in OZI-allowed decay channels in the experiment.

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