Measurement of $J/ψ$ production in continuum $e^+e^-$ annihilations near $\sqrt s = 10.6$ GeV

Details Measurement of $J/ψ$ production in continuum $e^+e^-$ annihilations near $\sqrt s = 10.6$ GeV Measurement of $J/ψ$ production in continuum $e^+e^-$ annihilations near $\sqrt s = 10.6$ GeV

2001-06-08

arxiv.org/abs/hep-ex/0106044v2

Phys.Rev.Lett.87:162002,2001

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 5 figures, published as Physical Review Letters 87 (2001) 162001

Scientific paper

10.1103/PhysRevLett.87.162002

The production of $J/\psi$ mesons in continuum $e^+e^-$ annihilations has been studied with the BABAR detector at energies near the $\Upsilon(4S)$ resonance, approximately 10.6 GeV. The mesons are distinguished from $J/\psi$ production in B decays through their center-of-mass momentum and energy. We measure the cross section $e^+e^-\to J/\psi X$ to be $2.52\pm 0.21\pm 0.21$ pb; for momentum above 2 GeV/c, it is $1.87\pm 0.10\pm 0.15$ pb. We set a 90% confidence level upper limit on the branching fraction for direct $\Upsilon(4S)$\to J/\psi X$ decays at $4.7\times 10^{-4}$.

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