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Systematic study of the singularity mechanism in heavy quarkonium decays
Wang, Q; Hanhart, C; Zhao Q(赵强); Zhao, Q
Source PublicationPHYSICS LETTERS B
AbstractWe 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.
Subject AreaPhysics
WOS IDWOS:000322606800012
ADS Bibcode2013PhLB..725..106W
ADS URLhttps://ui.adsabs.harvard.edu/abs/2013PhLB..725..106W
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2013PhLB..725..106W/citations
Citation statistics
Cited Times:76 [INSPIRE]
Cited Times:73 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
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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