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Systematic study of the singularity mechanism in heavy quarkonium decays
Wang, Q; Hanhart, C; Zhao Q(赵强); Zhao, Q
2013
发表期刊PHYSICS LETTERS B
卷号725期号:1-3页码:106-110
摘要We investigate in detail the role of heavy meson loops in the transition from J(PC) = 1(--) sources to candidates for QCD "exotics", such as Z(c)(3900), Z(b) (10610) and 4(10650). We demonstrate that, if a vector state strongly couples to a heavy meson pair in an S-wave and this system decays to another heavy meson pair (e.g. via pion emission), again in an S-wave, the pertinent diagrams get enhanced significantly, if the intermediate states are (near) on-shell and have small relative momenta. In a limited kinematic range this mechanism generates "singularity regions" that lead to the creation of a large number of low-energy heavy meson pairs, providing an ideal environment for the formation of hadron-hadron bound states or resonances. For instance, we predict that the signals for Z(b) and Z(b)' should be a lot stronger in Y(6S) decays due to this mechanism, if these states are indeed hadron-hadron resonances. The findings of this work should be valuable for deepening our understanding of the nature of the mentioned states. (C) 2013 Elsevier B.V. All rights reserved.
学科领域Physics
DOI10.1016/j.physletb.2013.06.049
收录类别SCI
WOS记录号WOS:000322606800012
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/223844
专题理论物理室
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Wang, Q,Hanhart, C,Zhao Q,et al. Systematic study of the singularity mechanism in heavy quarkonium decays[J]. PHYSICS LETTERS B,2013,725(1-3):106-110.
APA Wang, Q,Hanhart, C,赵强,&Zhao, Q.(2013).Systematic study of the singularity mechanism in heavy quarkonium decays.PHYSICS LETTERS B,725(1-3),106-110.
MLA Wang, Q,et al."Systematic study of the singularity mechanism in heavy quarkonium decays".PHYSICS LETTERS B 725.1-3(2013):106-110.
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