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A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current (Formula presented.) scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb(Formula presented.) and span six orders of magnitude in negative four-momentum-transfer squared, (Formula presented.), and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in (Formula presented.). An extraction of (Formula presented.) and results on electroweak unification and scaling violations are also presented.

Original languageEnglish
Article number580
Pages (from-to)1-98
Number of pages98
JournalEuropean Physical Journal C
Volume75
Issue number12
DOIs
StatePublished - 1 Dec 2015

    Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

ID: 100858089