A model-dependent study showing that the existence of a DDD* bound state is tied to the virtual-state pole position of Zc(3900), with binding occurring only for near-threshold Zc poles.
Measurement of the near-threshold $e^+e^- \to D \bar D$ cross section using initial-state radiation
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abstract
We report measurements of the exclusive cross section for $e^+e^- \to D \bar D $, where $D=D^0$ or $D^+$, in the center-of-mass energy range from the $D \bar D $ threshold to $5\mathrm{GeV}/c^2$ with initial-state radiation. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 673 $\mathrm{fb}^{-1}$.
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Constraining the $DDD^*$ three-body bound state via the $Z_c(3900)$ pole
A model-dependent study showing that the existence of a DDD* bound state is tied to the virtual-state pole position of Zc(3900), with binding occurring only for near-threshold Zc poles.