Search for Prompt Production of ${\chi }_c$ and X(3872) in e^+e^- Annihilations

Abstract

We have searched for prompt production of ${\chi }_{c1}$, ${\chi }_{c2}$ and X(3872) in continuum e^+e^- annihilations using a 386 fb^{-1} data sample collected around $\sqrt{s}=10.6$ GeV with the BABAR detector using the $\gamma J/\psi$ decay mode. After accounting for the feed-down from $\psi (2S)\to \gamma {\chi }_{c1,2}$, no significant signal for prompt ${\chi }_{c1,2}$ production is observed. We present improved upper limits on the cross-section, with the rest of the event consisting of more than two charged tracks, to be 77 fb for ${\chi }_{c1}$ and 79 fb for ${\chi }_{c2}$ with $e^{+}{e}^{-}$ center-of-mass frame ${\chi }_c$ momentum greater than 2.0 GeV at 90% confidence level. These limits are consistent with NRQCD predictions. We also set an upper limit on the prompt production of X(3872) through the decay $X(3872)\to \gamma J/\psi$.

8 pages 1 figure submitted to Phys. Rev. D (Rapid Communications)