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

Abstract

The production of $J/\psi$ mesons in continuum $e^{+}{e}^{-}$ annihilations has been studied with the BABAR detector at energies near the ${\rm Y}(4S)$ 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 ${\rm Y}(4S)$\to J/ψX$decaysat$4.7\times 10^{-4}$.

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

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