More hidden heavy quarkonium molecules and their discovery decay modes

More hidden heavy quarkonium molecules and their discovery decay modes
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更多隐藏的重夸克分子及其发现的衰变模式

DOI:
10.1103/physrevd.90.054006
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发表时间:
2014-09
期刊:
Physical Review D - Particles, Fields, Gravitation and Cosmology
影响因子:
--
通讯作者:
Zhu Zhou
Zhu Zhou
中科院分区:
其他
文献类型:
--
作者:
Gang Li;Xiao Hai Liu;Zhu Zhou

文献摘要

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为了验证所观察到的Z(B)(10610)/Z(B)(10650)和Z(c)(3900)/Z(c)(4025)的分子描述,研究它们的对应物,在本工作中表示为Z(QV)((QV '()),以及相应的衰变模式是有价值的。在这项工作中,我们提出了一个分析的Z(QV)((QV '())使用味对称。我们还利用基于重夸克对称性的有效拉格朗日量探讨了重散射机制,并计算了同位旋守恒通道Z(QV)((Q '())-> eta V-Q的部分宽度.对于Z(QV)-> eta V-Q,预测的部分宽度为MeV的量级,其对应于类似于10(-1)的10(-2)量级的分支比。对于Z(QV)' -> eta V-Q,部分宽度为几百keV,分支比约为10(-3)。未来的实验测量可以检验我们对部分宽度的预测,从而检验重类夸克奇异态的分子描述。
To validate the molecular description of the observed Z(b)(10610)/Z(b)(10650) and Z(c)(3900)/Z(c)(4025), it is valuable to investigate their counterparts, denoted as Z(QV)(()'()) in this work, and the corresponding decay modes. In this work, we present an analysis of the Z(QV)(()'()) using flavor symmetry. We also use the effective Lagrangian based on the heavy quark symmetry to explore the rescattering mechanism and calculate the partial widths for the isospin conserved channels Z(QV)(()'()) -> eta V-Q. The predicted partial widths are of an order of MeV for Z(QV) -> eta V-Q which corresponds to branching ratios of the order 10(-2) similar to 10(-1). For Z(QV)' -> eta V-Q, the partial widths are a few hundreds of keV and the branching ratios are about 10(-3). Future experimental measurements can test our predictions on the partial widths and thus examine the molecule description of heavy quarkoniumlike exotic states.