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Published October 15, 2001 | Published
Journal Article Open

Measurement of J/ψ Production in Continuum e^+e^− Annihilations near √s = 10.6 GeV


The production of J/ψ mesons in continuum e^+e^− annihilations has been studied with the BABAR detector at energies near the Υ(4S) resonance. The mesons are distinguished from J/ψ production in B decays through their center-of-mass momentum and energy. We measure the cross section e^+e^− → J/ψX to be 2.52±0.21±0.21pb. We set a 90% C.L. upper limit on the branching fraction for direct Υ(4S) → J/ψX decays at 4.7×10^(-4).

Additional Information

© 2001 The American Physical Society. Received 8 June 2001; published 27 September 2001. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.A.), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF (Germany), INFN (Italy), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from the Swiss NSF, A. P. Sloan Foundation, Research Corporation, and Alexander von Humboldt Foundation.

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Published - PhysRevLett.87.162002.pdf


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