Exclusive Initial-State-Radiation Production of the $D \bar D$, $D \bar D^*$, and $D^* \bar D^*$, Systems

TL;DR

This study investigates the production of specific D meson pairs in electron-positron collisions to identify charmonium states and potential new resonances, using data from the BaBar experiment at 10.58 GeV.

Contribution

It provides the first detailed analysis of exclusive D meson pair production in initial-state-radiation events at this energy, searching for new charmonium-like states.

Findings

Observed several $$ resonances in the mass spectra.

No evidence found for $Y(4260)$ decaying into $D ar D^*$ or $D^* ar D^*$.

Abstract

We perform a study of the exclusive production of $D \bar D$, $D \bar D^*$, and $D^* \bar D^*$ in initial-state-radiation events, from $e^+ e^-$ annihilations at a center-of-mass energy near 10.58 GeV, to search for charmonium and possible new resonances. The data sample corresponds to an integrated luminosity of 384 $fb^{-1}$ and was recorded by the BaBar experiment at the PEP-II storage rings. The $D \bar D$, $D \bar D^*$, and $D^* \bar D^*$ mass spectra show clear evidence of several $\psi$ resonances. However, there is no evidence for $Y(4260) \to D \bar D^*$ or $Y(4260)\to D^* \bar D^*$.