Abstract
Using the ARGUS detector at the DORIS II storage ring we have studied the production of antideuterons in e +e − annihilation at centre-of-mass energies around 10 GeV. From 21 events containing d candidates we determined the inclusive cross section 1 σ dir had · dσ/ dp and the production rate in direct hadronic ϒ(1S), ϒ(2S) decays, which was measured to be (6.0 ± 2.0 ± 0.6)·10 −5 d per event while in the continuun e + e − → q q only an upper limit of 1.7. · 10 −5 d per event (90% CL) could be obtained. Comparisons with a simple model and other ARGUS measurements hint at the underlaying production mechanism of antideuterons.
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