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arXiv 1904.08271hep-phhep-ex
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从$χ_{cJ}$衰变到$ϕK^* \bar K, ϕh_1(1380)$检验轴向矢量介子共振的性质

The $χ_{cJ}$ decay to $ϕK^* \bar K, ϕh_1(1380)$ testing the nature of axial vector meson resonances

Sheng-Juan Jiang, S. Sakai, Wei-Hong Liang, E. Oset

摘要:

我们对$χ_{cJ} \to ϕK^* \bar K \to ϕKπ\bar K$反应进行了理论研究,同时考虑了$K^* \bar K$终态相互作用,在手征么正方法中,$K^* \bar K$终态相互作用与其耦合通道一起负责低位轴向矢量介子的形成,在这种情况下,给出了选择的量子数的$h_1(1380)$。基于这个图像,我们可以很容易地解释为什么在$χ_{c0}$衰变中没有产生$h_1(1380)$共振,以及在$χ_{c1}$和$χ_{c2}$衰变的情况下,为什么$K^+ π^0 K^-$质量分布的下降出现在1550-1600 MeV区域,在我们的图像中,这来自树级机制和产生$h_1(1380)$态的再散射之间的相消干涉。在标称$h_1(1380)$信号被非相干地添加到背景的图片中不再现这样的下降,这为其中谐振从矢量-伪标量分量的再散射出现的图片提供支持。

英文摘要:

We perform a theoretical study of the $χ_{cJ} \to ϕK^* \bar K \to ϕKπ\bar K$ reaction taking into account the $K^* \bar K$ final state interaction, which in the chiral unitary approach is responsible, together with its coupled channels, for the formation of the low lying axial vector mesons, in this case the $h_1(1380)$ given the selection of quantum numbers. Based on this picture we can easily explain why in the $χ_{c0}$ decay the $h_1(1380)$ resonance is not produced, and, in the case of $χ_{c1}$ and $χ_{c2}$ decay, why a dip in the $K^+ π^0 K^-$ mass distribution appears in the 1550-1600 MeV region, that in our picture comes from a destructive interference between the tree level mechanism and the rescattering that generates the $h_1(1380)$ state. Such a dip is not reproduced in pictures where the nominal $h_1(1380)$ signal is added incoherently to a background, which provides support to the picture where the resonance appears from rescattering of vector-pseudoscalar components.

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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