We perform a study of exclusive production of$D^+_sD^-_s$, $D^{ *+}_sD^-_s$, and $D^{ *+}_sD^{ *-}_s$ final states in initial-state-radiation events from $e^+ e^-$ annihilations at a center-of-mass energy near 10.58 GeV, to search for charmonium $1^{ --}$ states. The data sample corresponds to an integrated luminosity of 525 $fb^{ -1}$ and was recorded by the BaBar experiment at the PEP-II storage ring. The $D^+_sD^-_s$, $D^{ *+}_sD^-_s$, and $D^{ *+}_sD^{ *-}_s$ mass spectra show evidence of the known $\psi$ resonances. Limits are extracted for the branching ratios of the decays $X(4260)\to D^{ (*)+}_sD^{ (*)-}_s$.
Categories: hep-ex