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Pion exchange in an S wave between hadrons that are themselves in a relative S wave can shift energies by hundreds of MeV. In the case of charmed mesons D, D*, D₀, D₁, a spectroscopy of quasimolecular states may arise consistent with enigmatic charmonium states observed above 4 GeV in e⁺e^- annihilation. A possible explanation of Y(4260)→ψππ and Y(4360)→ψ^'ππ is found. Searches in DD̄3π channels as well as B decays are recommended to test this hypothesis.
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Close et al. (2009) studied this question.
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