Experimental test of the flavor independence of the quark-gluon coupling constant

Reconstruction of charged Dsup(*)'s produced inclusively in e+e- annihilations at CM energies near 34,4 GeV is accomplished in the decay modes Dsup(*+) -> D0π+ -> K-π+π0π+ and Dsup(*+) -> D0π+ -> K-π+π-π+π+ and their charge conjugates. Using these and previously reported Dsup(*+) -> D0π+ -> K-π+π+ and Dsup(*+) -> D0π+ -> K-π+π+ + missing π0 channels we present evidence for hard gluon bremsstrahlung from charm quarks and show that the ratio of the quark-gluon coupling constant of charm quarks to the coupling constant obtained in the average hadronic event, αsub(s)sup(c)/αsub(s)=1.00 +- 0.20 +- 0.20. Our results provides evidence that the quark-gluon coupling constant is independent of flavor. (orig.)