5. Conclusions

Our most important result is that in annihilation at very high energy, leptons derived from the decay of charmed particles or heavier particles with new flavors are likely to be very soft (see figs. 1--7 and table 1). This result is very insensitive to the details of the model and, we believe, has a much more general validity than the parton fragmentation picture which we used to construct a reasonable inclusive D spectrum. We repeat our earlier conclusions that excellent electron and muon detection at low energy will be very desirable in experiments at PETRA/PEP energies.

M.G. thanks R.J.N. Phillips at Rutherford Laboratory and H. Joos at DESY for their hospitality during the course of this work. T.W. would like to express his thanks to K. Fujikawa.

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