Abstract

We report on progress in the determination of the unpolarised nucleon PDFs within the ABM global fit framework. The data used in the ABM analysis are upd ated including the charmproduction and the high-Q 2 neutral-current samples obtained at the HERA collider, as well as the LHC data on the differential Drell-Yan cross-sections. An updated set of the PDFs with improved experimental and theoretical accuracy at small x is presented. We find minimal impact of the t-quark production cross section measured at the Tevatron and the LHC on the gluon distribution and the value of the strong coupling constant αs determined from the ABM fit in the case of the t-quark running-mass definition. In particular, the value of αs(MZ) = 0.1133± 0.0008 is obtained from the variant of the ABM12 fit with the Tevatron and CMS t-quark production cross-section data included and the MS value of mt(mt) = 162 GeV.

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