We present a study of differential two jet ratios in multi-hadronic final states produced by e+e- annihilation in the AMY detector at TRISTAN. The data are compared to the predictions of the next-to-leading logarithm parton-shower (NLL PS) Monte Carlo and the O(αs2) matrix element QCD models. We determine the strong coupling strength αs(57.3 GeV) = 0.130 ± 0.006.
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We thank the TRISTAN staff for the excellent operation of the storage ring. We would like to thank T. Munehisa and K. Kato for helpful suggestionsa nd discussions. This work has been supported by the Japan Ministry of Education, Science and Culture (Monbbusho) and Society for the Promotion of Science, the US Departmento f Energy and National Science Foundation, the Korean Science and Engineering Foundation and Ministry of Education, and the Academia Sinica of the People’s Republic of China.