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

2017; American Physical Society; Volume: 95; Issue: 3 Linguagem: Inglês

10.1103/physrevd.95.034003

2470-0037

Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, J. Huston, Pavel Nadolsky, Jon Pumplin, Carl R. Schmidt, Daniel R. Stump, C.–P. Yuan,

Quantum Chromodynamics and Particle Interactions

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.