Renormalization Scheme Dependence in the QCD R-Ratio beyond O(α_s^2) : Particles and Fields

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概要

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• We analyze the QCD effects in the R-ratio. We consider their renormalization scheme (RS) dependence. We cannot fix the scale parameter from the second order analysis for any choice of the RS, because of the large third order correction term. We obtain an upper bound of the scale parameter as Λ_<<MS>^^^->≦280±^<270>_<170> MeV. We show that it is possible to fix the scale parameter from the third order analysis and it may be a certain value satisfying Λ_<<MS>^^^-><170 MeV except for the large negative fourth order correction term.

• 理論物理学刊行会の論文
• 1989-08-25

著者

• Haruyama Masahiro

  Laboratory Of Physics Asahikawa Medical College

• HARUYAMA Masahiro

  Laboratory of Physics, Asahikawa Medical College

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• Renormalization Scheme Dependence in the QCD R-Ratio beyond O(α_s^2) : Particles and Fields
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• A Note on Topological Sasceptibility, Gluon Condensate and QCD Scale Parameter
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