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Isospin mixing in charmonium states


The "molecular" charmonium models predict both I = 0 and I = 1 states. The closeness of one of these (4.028 GeV) to one of its main thresholds and the large electromagnetic mass splitting of its daughters may induce a large mixing between states of different isospin. This would manifest itself in deviations from unity of the ratio of charged to neutral decay modes. © 1977 The American Physical Society.

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