Measurement of J/ψ production in continuum e⁺e⁺ annihilations near √s = 10.6 GeV

B Aubert, Paul Bright-Thomas, Theresa Harrison, Christopher Hawkes, Andrew Kirk, David Knowles, Stephen O'Neale, Richard Penny, Alan Watson, Nigel Watson

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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. 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).
Original languageEnglish
Pages (from-to)162002
Number of pages1
JournalPhysical Review Letters
Issue number16
Early online date1 Sept 2001
Publication statusPublished - 1 Oct 2001


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