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Measurement of J/psi production in continuum e^+e^- annihilations near sqrt s = 10.6 GeV
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Measurement of J/psi production in continuum e^+e^- annihilations near sqrt s = 10.6 GeV
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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 $4.7\times 10^{-4}$.
Forward citations
Cited by 1 Pith paper
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Revisiting relativistic corrections to inclusive $J/\psi$ production at B factories: Complete expansion for three-body quarkonium production
Full final-state kinematic expansion yields scheme-independent O(v²) corrections of about −14.6% (cc̄) and +12% (non-cc̄) for inclusive J/ψ at B factories, yet tension with Belle data remains.
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