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An experimental measure is presented for a precise test of quantum chromodynamics. This measure involves the asymmetry in the energy-weighted opening angles of the jets of hadrons produced in the process e^+e^- at energy W. It is special for several reasons: It is reliably calculable in asymptotically free perturbation theory; it has rapidly vanishing (order 1{W^2}) corrections due to nonperturbative confinement effects; and it is straightforward to determine experimentally.
Basham et al. (Mon,) studied this question.
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