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The role of different schemes in the QCD analysis and determination of the strong coupling. (English) Zbl 1370.81188
Summary: In this article, we present a Next-to-Leading Order (NLO) QCD analysis to study the role and influence of different schemes on simultaneous determination of the Parton Distribution Functions (PDFs) and strong coupling, \(\alpha_s(M_Z^2)\). We perform our analysis based on three different data sets, HERA I and II combined data, H1-ZEUS charm combined data, and H1 and ZEUS beauty production cross sections data, in two different Thorne-Roberts (TR or RT) and Thorne-Roberts Optimal (RT OPT) schemes. We show in going from RT scheme to RT OPT scheme, in addition of reduction the uncertainty of some PDFs, specially for the gluon distribution, we get \(\sim 0.4 \%\) and \(\sim 0.7 \%\) improvement in the fit quality and \(\sim 0.9 \%\) and \(\sim 1.6 \%\) improvement for the strong coupling, \(\alpha_s(M_Z^2)\), without and with heavy flavor contributions, respectively.
MSC:
81V05 Strong interaction, including quantum chromodynamics
81V35 Nuclear physics
81U35 Inelastic and multichannel quantum scattering
81T15 Perturbative methods of renormalization applied to problems in quantum field theory
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