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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2001 Oct 15;87(16):162002. doi: 10.1103/PhysRevLett.87.162002. Epub 2001 Sep 27.
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).
利用BABAR探测器在接近Upsilon(4S)共振的能量下，对连续电子正电子湮灭中J/psi介子的产生进行了研究。通过其质心动量和能量，将这些介子与B衰变中J/psi的产生区分开来。我们测得e(+)e(-)-->J/psi X的截面为2.52±0.21±0.21 pb。我们设定了直接Upsilon(4S)-->J/psi X衰变分支比的90%置信水平上限为4.7×10^(-4)。
