Dynamical picture for the formation and decay of the exotic XYZ mesons

We present a new dynamical picture that identifies the formation of the exotic c[over ¯]c-containing states XYZ with the confinement-induced hadronization of a rapidly separating pair of a compact diquark and antidiquark. This picture combines the advantages of diquark-based models, which can accomm...

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Bibliographic Details
Published inPhysical review letters Vol. 113; no. 11; p. 112001
Main Authors Brodsky, Stanley J, Hwang, Dae Sung, Lebed, Richard F
Format Journal Article
LanguageEnglish
Published United States 12.09.2014
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Summary:We present a new dynamical picture that identifies the formation of the exotic c[over ¯]c-containing states XYZ with the confinement-induced hadronization of a rapidly separating pair of a compact diquark and antidiquark. This picture combines the advantages of diquark-based models, which can accommodate much of the known XYZ spectrum, with the experimental fact that such states are both relatively narrow and are produced promptly. It also naturally explains the preference of some of the exotic states to decay to ψ(2S), rather than J/ψ, in terms of a simple wave-function overlap effect.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.113.112001