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±0.21 pb. We set a 90% C.L. upper limit on the branching fraction for direct ϒ(4S)→J/ψX decays at 4.7×10-4.
Measurement of j / psi production in continuum e+ e- annihilations near s**(1/2) = 10.6-GeV
CAVALLO, Nicola;FABOZZI, FRANCESCO;
2001-01-01
Abstract
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±0.21 pb. We set a 90% C.L. upper limit on the branching fraction for direct ϒ(4S)→J/ψX decays at 4.7×10-4.File in questo prodotto:
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