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Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data
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abstract
A recent report of $e^+ e^- \to D\bar D$ events by the BESIII Collaboration suggests the presence of a structure $R$ at 3900~MeV\@. We argue that this structure, called $G(3900)$ in the past, is not in fact due to a new $c\bar c$ resonance, but rather naturally emerges as a threshold enhancement due to the opening of the $D^*\bar D$ channel. We further find that the appearance of this structure does not require suppression because of a radial node in the $\psi(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $\psi(4040)$ is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section $\sigma(e^+ e^- \to D\bar D)$ at energies near $\psi(3770)$.
Forward citations
Cited by 3 Pith papers
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Dispersive Analysis of $D$- and $B$-Meson Form Factors with Chiral and Heavy-Quark Constraints
The isovector D/D*/B/B* electromagnetic form factors are reconstructed dispersively with ππ rescattering, yielding ρ(770) coupling constants from pole residues.
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Resonance parameters of the vector charmoniumlike state $G(3900)$
A coupled-channel fit to e+e- to D meson pairs finds that G(3900) is a dynamically generated P-wave D Dbar* resonance.
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Updated analysis of charmonium states in a relativized quark potential model
A recalibrated relativized quark model assigns chi_c1(4010), chi_c1(4274), chi_c0(4500), and chi_c0(4700) to conventional charmonium states and predicts chi_c0(2P) near 3851 MeV.
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