Abstract
The production of the Y(9.46)- and Y'(10.02)-resonances in e+e--annihilation has been observed in three, respectively two, different experiments at DORIS. The observed leptonic decay widths are consistent with Y and Y' being the ground and the first excited state of a bound bb̄ system, where b represents a heavy quark with charge - 1/3. The event topology at energies outside the Y resonances clearly exhibit 2-jet structure in good agreement with the quark parton model. The characteristics of the Y direct hadronic decays are consistent with the 3 gluon model.
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