An unquenched mechanism with virtual charmed mesons mediating one-boson exchange reproduces the observed di-J/ψ invariant mass spectrum.
Additionally, the higher threshold for producing charmed-strange meson pairs leads to further suppression by the loop function
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Discovering an Unquenched Dynamics Mechanism for Charmonium Scattering
An unquenched mechanism with virtual charmed mesons mediating one-boson exchange reproduces the observed di-J/ψ invariant mass spectrum.