Impact of the HERA I+II combined data on the CT14 QCD global analysis

¹ School of Physics Science and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China.
² Department of Physics, Southern Methodist University, Dallas, TX 75275-0181, U.S.A.
³ High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, U.S.A.
⁴ The University of Manchester, Oxford Road, M13 9PL Manchester, Manchester.
⁵ Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, U.S.A.

^* Presenter, e-mail: marco.guzzi@manchester.ac.uk

Published online: 25 November 2016

Abstract

A brief description of 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 is given. The new CT14_HERA2 PDFs at NLO and NNLO are illustrated. They employ the same parametrization used in the CT14 analysis, but with an additional shape parameter for describing the strange quark PDF. The HERA I+II data are reasonably well described by both CT14 and CT14_HERA2 PDFs, and differences are smaller than the PDF uncertainties of the standard CT14 analysis. Both sets are acceptable when the error estimates are calculated in the CTEQ-TEA (CT) methodology and the standard CT14 PDFs are recommended to be continuously used for the analysis of LHC measurements.