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We study $e^+e^-\to J/\psi c\bar{c}$ by measuring the invariant massdistribution recoiling against fully reconstructed $J/\psi$ decays, using 124fb$^{-1}$ of data collected with a center-of-mass energy of 10.6 GeV with the$BaBar$ detector. We observe signals for $\eta_c(1S)$, $\chi_{c0}$, and$\eta_c(2S)$ in the recoil mass distribution, thus confirming previousmeasurements. We measure $\sigma(e^+e^-\to J/\psi+c\bar{c}) {\cal B} (c\bar{c}\to >2 \mathrm{charged})$ to be  $17.6\pm2.8\textrm{(stat)}^{+1.5}_{-2.1}\textrm{(syst)}$ fb,  $10.3\pm2.5\textrm{(stat)}^{+1.4}_{-1.8}\textrm{(syst)}$ fb, and$16.4\pm3.7\textrm{(stat)}^{+2.4}_{-3.0}\textrm{(syst)}$ fb with$c\bar{c}=\eta_c(1S)$, $\chi_{c0}$, and $\eta_c(2S)$, respectively.Comment: 7 pages, 2 postscript figue

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Measurement of double charmonium production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>annihilations at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>10.6</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>

Measurement of double charmonium production ine+e−annihilations ats=10.6 GeV