$a_S$, ABM PDFs, and heavy-quark masses
2019 July 22
2019 September 13
The value of αs is extracted from a global QCD analysis of experimental data on inclusive neutral-current (NC) and charged-current (CC) deep-inelastic scattering (DIS),c- and b-quark production in the NC DIS,c-quark production in the CC DIS, and W-, Z-boson, and t-quark production in (anti)proton-proton collisions with a simultaneous extraction of parton distribution functions(PDFs). The NNLO value of α(nf=5)s(mZ) =0.1147±0.0008(exp.)±0.0022(h.o.)is obtained with the uncertainty due to missing higher-orders (h.o.) being estimated as one half of the difference between the values of αs obtained in the NNLO and NLO variants of this fit. The masses of the heavy-quarks, charm, beauty and top, which are determined in parallel, are employed for cross-check of the theoretical framework consistency of the analysis.