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

Stanley J. Brodsky, Dae Sung Hwang, Richard Lebed

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Abstract

We present a new dynamical picture that identifies the formation of the exotic c¯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.

Original languageEnglish (US)
Article number112001
JournalPhysical Review Letters
Volume113
Issue number11
DOIs
StatePublished - Sep 12 2014

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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