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We discuss the necessity of a separation of quarks and gluons in qq̄g three-jet events in e⁺e^- annihilation in order to obtain quantitative tests of quantum chromodynamics. The possibility of such a separation is investigated with special emphasis on the case that one or two of the jets are identified as quark jets by a semileptonic decay of a c or b quark. It is shown in detail how gluon energy spectra and gluon-jet properties can be deduced from these measurements.
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Nilles et al. (1981) studied this question.
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