Production of Prompt Charmonia in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}\approx 10.6$ GeV

Abstract

The production of prompt $J/\psi$, $\psi (2S)$, ${\chi }_{c1}$ and ${\chi }_{c2}$ is studied using a $32.4f{b}^{-1}$ data sample collected with the Belle detector at the ${\rm Y}(4S)$ and 60 MeV below the resonance. The yield of prompt $J/\psi$ mesons in the ${\rm Y}(4S)$ sample is compatible with that of continuum production; we set an upper limit $\mathcal{B}({\rm Y}(4S)\to J/\psi X)<1.9\times 10^{-4}$ at the 95% confidence level, and find $\sigma (e^{+}{e}^{-}\to J/\psi X)=1.47\pm 0.10\pm 0.13$ pb. The cross-sections for prompt $\psi (2S)$ and direct $J/\psi$ are measured. The $J/\psi$ momentum spectrum, production angle distribution and polarization are studied.

submitted to Phys. Rev. Lett

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