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

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

2001-10-05

arxiv.org/abs/hep-ex/0110012v1

Phys.Rev.Lett.88:052001,2002

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.052001

The production of prompt $J/\psi$, $\psi(2S)$, $\chi_{c1}$ and $\chi_{c2}$ is studied using a $32.4 fb^{-1}$ data sample collected with the Belle detector at the $\Upsilon(4S)$ and 60 MeV below the resonance. The yield of prompt $J/\psi$ mesons in the $\Upsilon(4S)$ sample is compatible with that of continuum production; we set an upper limit ${\cal B}(\Upsilon(4S) \to J/\psi X) < 1.9 \times 10^{-4}$ 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.

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