A New Picture for the Formation and Decay of the Exotic $XY \! Z$ Mesons
| Autor: | Brodsky, Stanley J., Hwang, Dae Sung, Lebed, Richard F. |
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| Rok vydání: | 2014 |
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| Zdroj: | Phys. Rev. Lett. 113, 112001 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.113.112001 |
| Popis: | We present a new dynamical picture that identifies the formation of the exotic $\bar c c$-containing states $XY \! Z$ 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 $XY \! Z$ 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 $\psi(2S)$, rather than $J/\psi$, in terms of a simple wave-function overlap effect. Comment: 5 pages, 4 .eps figures, ReVTeX. References added |
| Databáze: | arXiv |
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