| Abstract |
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A study of exclusive production of the $D \bar D$ system through initial-state radiation
is performed in a search for charmonium states, where
$D=D^0$ or $D^+$. The $D^0$ mesons are reconstructed
in the $D^0 \to K^- \pi^+$, $D^0 \to K^- \pi^+ \pi^0$, and
$D^0 \to K^- \pi^+ \pi^+ \pi^-$ decay modes.
The $D^+$ is reconstructed through
the $D^+ \to K^- \pi^+ \pi^+$ decay mode.
The analysis makes use of an integrated luminosity of 288.5 fb$^{-1}$
collected by the BaBar experiment.
The $D \bar D$ mass spectrum shows a clear $\psi(3770)$ signal.
Further structures appear in the 3.9 and 4.1 GeV/$c^2$
regions. No evidence is found for $Y(4260)$ decays to $D \bar D$, implying an upper limit
$\frac{\BR(Y(4260)\to D \bar D)}{\BR(Y(4260)\to J/\psi \pi^+ \pi^-)} < 7.6$ (95\% confidence level).
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