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. 2001 Oct 15;87(16):162002.
doi: 10.1103/PhysRevLett.87.162002. Epub 2001 Sep 27.

Measurement of J/psi production in continuum e(+)e(-) annihilations near square root of s = 10.6 GeV

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Free article

Measurement of J/psi production in continuum e(+)e(-) annihilations near square root of s = 10.6 GeV

B Aubert et al. Phys Rev Lett. .
Free article

Abstract

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. 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(-)-->J/psi X to be 2.52+/-0.21+/-0.21 pb. We set a 90% C.L. upper limit on the branching fraction for direct Upsilon(4S)-->J/psi X decays at 4.7 x 10(-4).

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