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arXiv 1903.04789hep-ph
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底粲混合介子$c \bar{b} g$的质量和衰变

Masses and decays of the bottom-charm hybrid meson $c \bar{b} g$

Tomokazu Miyamoto, Shigehiro Yasui

摘要:

我们在成分胶子模型中研究了$B_{c} $介子内部的胶子激发,将底魅混合介子$ c \bar{b} g $视为三体系统。我们得到了磁胶子和电胶子混合介子的质量谱,发现它们的最低态出现在$ D B $阈值以上。此外,我们考虑了低激发态的杂化介子衰变为$ DB , \; D^{*} B, DB^{*} $,$ D^{*}B^{*} $,$ D_{s} B_{s} $和$D_{s} B_{s}^{*} $介子,发展了一个现有的强衰变模型。我们估计了它们的部分衰变宽度,发现这些宽度与末态介子态有很大的关系。我们认为,我们的模型的准确性将通过实验测试时,衰变的分支比测量。我们的研究结果表明,混合介子有可能作为它的第一个激发态而不是最低态被发现。

英文摘要:

We study gluonic excitations inside a $B_{c} $ meson in the constituent gluon model, treating a bottom-charm hybrid meson $ c \bar{b} g $ as a three-body system. We obtain the mass spectra for the hybrid mesons with magnetic gluon and electric gluon and see that their lowest states appear above the $ D B $ threshold. Also, we consider the decays of the low-lying states of the hybrid meson into $ DB , \; D^{*} B, DB^{*} $, $ D^{*}B^{*} $, $ D_{s} B_{s} $, and $D_{s} B_{s}^{*} $ mesons, developing an existing model for the strong decays. We estimate their partial decay widths and find that the widths have a heavy dependence on the final meson states. We argue that the accuracy of our model will be tested experimentally when the branching ratios of the decays are measured. Our results suggest that there could be a prospect that the hybrid meson will be discovered as its first excited state rather than its lowest state.

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