Limits on and ϒ production in e+e− interactions at

A search has been made for the inclusive production of J ψ (3.1) and Υ{hooked} (9.4) mesons in e+e- interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J ψ region, nor in the Υ{hooked} region. The limits on the cross sections are σ(e+e- → ψX) < 4.4 × 10-36cm2, and σ(e+e- → Υ{hooked}X) < 4.7 × 10-36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → l+l-X) < 0.8%. © 1983.