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e+e- angularity distributions at NNLL accuracy
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DOI：10.1007/JHEP01(2019)147.png)
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摘要
En 中文
We present predictions for the e(+)e(-) event shape angularities at NNLL resummed and O) open=(s2 matched accuracy and compare them to LEP data at center-of-mass energies Q = 91.2 GeV and Q = 197 GeV. We perform the resummation within the framework of Soft-Collinear Effective Theory, and make use of recent results for the two-loop angularity soft function. We determine the remaining NNLL and O ingredients from a fit to the EVENT2 generator, and implement a shape function with a renormalon-free gap parameter to model non-perturbative effects. Using values of the strong coupling (s)(m(Z)) and the universal non-perturbative shift parameter (1) that are consistent with those obtained in previous fits to the thrust and C-parameter distributions, we find excellent agreement between our predictions and the LEP data for all angularities with a [-1, 0.5]. This provides a robust test of the predictions of QCD, factorization, and the universal scaling of the non-perturbative shift across different angularities. Promisingly, our results indicate that current degeneracies in the {(s)(m(Z)), (1)} parameter space could be alleviated upon fitting these parameters to experimental data for the angularity distributions.
Keyword:
Resummation
Perturbative QCD
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5.5
论文数:
4.0W
被引数:
13.7W
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