We present a study of the third moment of the inclusive momentum distribution of particles within jets produced by e+ e- annihilation at TRISTAN. In this analysis, the QCD coupling strength αs is determined by fits to the prediction of the Next-to-Leading Logarithm Parton-Shower model. The measured value of αs(57.9 GeV) = 0.134-0.005+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 suggestions and discussions. This work has been supported by the Japan Ministry of Education, Science and Culture (Mon-busho) and Society for the Promotion of Science, the US Department of 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.