Measurement of the Charged Multiplicity of Z

J. A. Snyder, M. D. Sokoloff, P. Stamer, H. Steiner, R. Steiner,I. E. Stockdale,M. G. Strauss, F. Suekane, A. Sugiyama, S. Suzuki, M. Swartz, A. Szumilo, T. Takahashi, F. E. Taylor, M. Tecchio,J. J. Thaler,N. Toge,E. Torrence, M. Turcotte, T. Usher, C. Vannini, E. Vella,J. P. Venuti, R. Verdier,P. G. Verdini, S. Wagner,A. P. Waite, S. J. Watts,A. W. Weidemann,J. S. Whitaker,S. L. White,F. J. Wickens,D. A. Williams,D. C. Williams, S. H. Williams, S. Willocq,R. J. Wilson,W. J. Wisniewski,M. S. Witherell, M. Woods, J. Wyss,R. K. Yamamoto,J. M. Yamartino,S. J. Yellin, C. C. Young, H. Yuta, G. Zapalac,R. W. Zdarko, C. Zeitlin, M. Zolotorev, P. Zucchelli

semanticscholar（1993）

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摘要

Using an impact parameter tag to select an enriched sample of Z0 → bb events, we have measured the difference between the average charged multiplicity of Z0 → bb and Z0 → hadrons to be nb − nhad = 2.24 ± 0.30(stat.) ± 0.33(syst.) tracks per event. From this, we have derived nb − nuds = 3.31 ± 0.41 ± 0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that nb − nuds depends on energy. This result is in agreement with a precise prediction of perturbative QCD, and supports the notion that QCD remains asymptotically free down to the scale M2 b .

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