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A Precise Determination of $\alpha_s$ from the C-parameter Distribution

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arxiv 1501.04111 v2 pith:CP7CB5EQ submitted 2015-01-16 hep-ph

André H. Hoang , Daniel W. Kolodrubetz , Vicent Mateu , Iain W. Stewart This is my paper · ORCID
classification hep-ph
keywords alphaomegac-parameterdatadominantmathcalpredictionregion
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abstract

We present a global fit for $\alpha_s(m_Z)$, 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$^3$LL$^\prime$ + $\mathcal{O}(\alpha_s^3)$ + $\Omega_1$ theoretical prediction (up to the missing 4-loop cusp anomalous dimension), which includes power corrections coming from a field theoretical nonperturbative soft function. The dominant hadronic parameter is its first moment $\Omega_1$, which is defined in a scheme which eliminates the $\mathcal{O}(\Lambda_{\rm QCD})$ renormalon ambiguity. The resummation region plays a dominant role in the C-parameter spectrum, and in this region a fit for $\alpha_s(m_Z)$ and $\Omega_1$ is sufficient. We find $\alpha_s(m_Z)=0.1123\pm 0.0015$ and $\Omega_1=0.421\pm 0.063\,{\rm GeV}$ with $\chi^2/\rm{dof}=0.988$ for $404$ bins of data. These results agree with the prediction of universality for $\Omega_1$ between thrust and C-parameter within 1-$\sigma$.

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Cited by 6 Pith papers

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