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arXiv · 1609.07968

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

Tie-Jiun Hou·Sayipjamal Dulat·Jun Gao·Marco Guzzi·Joey Huston·Pavel Nadolsky·Jon Pumplin·Carl Schmidt·Daniel Stump·C. -P. Yuan
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Abstract

We analyze the impact of the recent HERA run I+II combination of inclusive deep inelastic scattering cross-section data on the CT14 global analysis of PDFs. New PDFs at NLO and NNLO, called CT14$_{\textrm{HERA2}}$, 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 I+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 CT14$_{\textrm{HERA2}}$ but with an additional shape parameter for describing the strange quark PDF. We find that the HERA I+II data can be fit reasonably well, and both CT14 and CT14$_{\textrm{HERA2}}$ PDFs can describe equally well the non-HERA data included in our global analysis. Because the CT14 and CT14$_{\textrm{HERA2}}$ 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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Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, Joey Huston, Pavel Nadolsky, Jon Pumplin, Carl Schmidt, Daniel Stump, C. -P. Yuan. 2016-09-26. CTEQ-TEA parton distribution functions and HERA Run I and II combined data. https://doi.org/10.1103/physrevd.95.034003

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