Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-11
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 9 figures; final version to be published in Phys. Lett. B. Tolerance analysis for individual experiments (figs.6, 7
Scientific paper
We determine the strong coupling alpha_s from a next-to-leading order analysis of processes used for the NNPDF2.1 parton determination, which includes data from neutral and charged current deep-inelastic scattering, Drell-Yan and inclusive jet production. We find alpha_s(M_Z)=0.1191+-0.0006 (exp), where the uncertainty includes all statistical and systematic experimental uncertainties, but not purely theoretical uncertainties. We study the dependence of the results on the dataset, by providing further determinations based respectively on deep-inelastic data only, and on HERA data only. The deep-inelastic fit gives the consistent result alpha_s(M_Z)=0.1177+-0.0009(exp), but the result of the HERA-only fit is only marginally consistent. We provide evidence that individual data subsets can have runaway directions due to poorly determined PDFs, thus suggesting that a global dataset is necessary for a reliable determination.
Ball Richard D.
Bertone Valerio
Cerutti Francesco
Debbio Luigi Del
Forte Stefano
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