CTEQ-TEA parton distribution functions and HERA Run I and II combined data

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Abstract

We analyze the impact of the recent HERA Run $\mathrm{I}+\mathrm{II}$ combination of inclusive deep inelastic scattering cross-section data on the CT14 global analysis of parton distribution functions (PDFs). New PDFs at next-to-leading order and next-to-next-to-leading order, called ${\mathrm{CT}14}_{\mathrm{HERA}2}$, are obtained by a refit of the CT14 data ensembles, in which the HERA Run I combined measurements are replaced by the new HERA Run $\mathrm{I}+\mathrm{II}$ combination. The CT14 functional parametrization of PDFs is flexible enough to allow good descriptions of different flavor combinations, so we use the same parametrization for ${\mathrm{CT}14}_{\mathrm{HERA}2}$ but with an additional shape parameter for describing the strange quark PDF. We find that the HERA $\mathrm{I}+\mathrm{II}$ data can be fit reasonably well, and both CT14 and ${\mathrm{CT}14}_{\mathrm{HERA}2}$ PDFs can describe equally well the non-HERA data included in our global analysis. Because the CT14 and ${\mathrm{CT}14}_{\mathrm{HERA}2}$ PDFs agree well within the PDF errors, we continue to recommend CT14 PDFs for the analysis of LHC Run 2 experiments.

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