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Perturbative quantum chromodynamics: Evidence that αs runs

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Il Nuovo Cimento A (1965-1970)

Summary

We consider the theoretical predictions of perturbative quantum chromodynamics (QCD) for the quantities\(R_{e^ + e^ - } \),R τ and Γ Z0hadronic . Using αs(M τ)=0.34 +0.04−0.05 , we find that αs (34 GeV)=0.140 +0.006−0.008 in agreement with the value extracted from experiment, αs (34 Gev)=0.148(22), and αs (M Z)=0.119(5), in excellent agreement with the experimental value from LEP, αs(M Z)=0.120(7). We show that using only the above value for αs(M τ) as input andno free parameters we can predict αs(μ) forM τ⩽μ⩽200 GeV. Our result is in agreement with all known experimental values. Thus it can be seen that αs truly runs, in agreement with perturbative QCD.

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References

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Authors and Affiliations

  1. Department of Physics, Oklahoma State University, 74078, Stillwater, OK, USA

    M. A. Samuel & E. Steinfelds

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  1. M. A. Samuel
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  2. E. Steinfelds
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Additional information

This work was supported by the U.S. Department of Energy under Grant No. DE-FG05-84ER40215.

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Samuel, M.A., Steinfelds, E. Perturbative quantum chromodynamics: Evidence that αs runs. Nuov Cim A 107, 831–835 (1994). https://doi.org/10.1007/BF02731099

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  • DOI: https://doi.org/10.1007/BF02731099

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