Precise determination of α[subscript s] from the C-parameter distribution
Name
PhysRevD.91.094018.pdf
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2.83 MB
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Author(s)
Mateu Barreda, Vicent
Hoang, Andre H.
Kolodrubetz, Daniel Walter
Stewart, Iain
Date Issued
May 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Hoang, Andre H., Daniel W. Kolodrubetz, Vicent Mateu, and Iain W. Stewart. “Precise Determination of α[subscript s] from the C-Parameter Distribution.” Phys. Rev. D 91, no. 9 (May 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We present a global fit for α[subscript s](m[subscript Z]), analyzing the available C-parameter data measured at center-of-mass energies between Q = 35 and 207 GeV. The experimental data is compared to a N[superscript 3]LL′ + O(α[3 over s]) + Ω[subscript 1] theoretical prediction (up to the missing four-loop cusp anomalous dimension), which includes power corrections coming from a field-theoretical nonperturbative soft function. The dominant hadronic parameter is its first moment Ω[subscript 1], which is defined in a scheme which eliminates the O(Λ[subscript QCD]) renormalon ambiguity. The resummation region plays a dominant role in the C-parameter spectrum, and in this region a fit for α[subscript s](m[subscript Z]) and Ω[subscript 1] is sufficient. We find α[subscript s](m[subscript Z]) = 0.1123 ± 0.0015 and Ω[subscript 1] = 0.421 ± 0.063 GeV with χ[superscript 2]/d.o.f. = 0.988 for 404 bins of data. These results agree with the prediction of universality for Ω[subscript 1] between thrust and C-parameter within 1-σ.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.094018
