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

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${}_{\text{HERA2}}$, 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${}_{\text{HERA2}}$ 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${}_{\text{HERA2}}$ PDFs can describe equally well the non-HERA data included in our global analysis. Because the CT14 and CT14${}_{\text{HERA2}}$ PDFs agree well within the PDF errors, we continue to recommend CT14 PDFs for the analysis of LHC Run 2 experiments.

arXiv comment19 pages, 6 figures and 3 tables

References in corpus (52)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Parton distributions for the LHC Run II
• New parton distributions for collider physics
• PDF4LHC recommendations for LHC Run II
• New parton distribution functions from a global analysis of quantum chromodynamics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Implications of CTEQ global analysis for collider observables
• Combined Measurement and QCD Analysis of the Inclusive ep Scattering Cross Sections at HERA
• The CT10 NNLO Global Analysis of QCD
• Geometric scaling for the total gamma^* p cross section in the low x region
• Leptoproduction of Heavy Quarks II -- A Unified QCD Formulation of Charged and Neutral Current Processes from Fixed-target to Collider Energies
• Measurement of the proton and deuteron structure functions, F2p and F2d, and of the ratio sigma(L)/sigma(T)
• Measurement of the neutral current cross section and F2 structure function for deep inelastic e+p scattering at HERA
• Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at sqrt(s) = 7 TeV
• Hard-scattering factorization with heavy quarks: A general treatment
• Measurement of the inclusive W+- and Z/gamma cross sections in the electron and muon decay channels in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• The ABM parton distributions tuned to LHC data
• Measurement and QCD Analysis of Neutral and Charged Current Cross Sections at HERA
• Leptoproduction of Heavy Quarks I-- General Formalism and Kinematics of Charged Current and Neutral Current Production Processes
• Open Heavy Flavor Production in QCD -- Conceptual Framework and Implementation Issues
• Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions
• Measurement of the Proton Structure Function F_2 at Very Low Q^2 at HERA
• Measurement of $W^{\pm }$ and $Z$-boson production cross sections in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Determination of the strange quark density of the proton from ATLAS measurements of the W->l nu and Z->ll cross sections
• Heavy Quark Mass Effects in Deep Inelastic Scattering and Global QCD Analysis
• Delineating parton distributions and the strong coupling
• Measurement of Neutral and Charged Current Cross Sections in Electron-Proton Collisions at High Q^2
• Measurement of Neutral and Charged Current Cross-Sections in Positron-Proton Collisions at Large Momentum Transfer
• Measurement of the Inclusive e{\pm}p Scattering Cross Section at High Inelasticity y and of the Structure Function FL
• Measurement of the Proton Structure Function F_2 and σ_{tot}^{γ^* p} at Low Q^2 and Very Low x at HERA
• Measurement of the muon charge asymmetry in inclusive pp to WX production at sqrt(s) = 7 TeV and an improved determination of light parton distribution functions
• Measurement of the Inclusive ep Scattering Cross Section at Low Q^2 and x at HERA
• Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s}=7$ TeV
• Measurement of inclusive W and Z boson production cross sections in pp collisions at sqrt(s) = 8 TeV
• Measurement of associated W + charm production in pp collisions at sqrt(s) = 7 TeV
• A Precision Measurement of the Inclusive ep Scattering Cross Section at HERA
• General-mass treatment for deep inelastic scattering at two-loop accuracy
• Measurement of the electron charge asymmetry in $\mathbf{p}\bar{\mathbf{p}}\to \mathbf{W}+\mathbf{X}\to \mathbf{e\nu }+\mathbf{X}$ decays in $\mathbf{p}\bar{\mathbf{p}}$ collisions at $\sqrt{\mathbf{s}}=1.96$ TeV
• High-Q^2 neutral current cross sections in e^+p deep inelastic scattering at sqrt{s}=318 GeV
• Determination of Strange Sea Quark Distributions from Fixed-target and Collider Data
• Deviations from NLO QCD evolution in inclusive HERA data
• Measurement of High-Q^2 Charged-Current e^+p Deep Inelastic Scattering Cross Sections at HERA
• Measurement of high-Q2 charged current cross sections in e-p deep inelastic scattering at HERA
• Charm-quark production in deep-inelastic neutrino scattering at NNLO in QCD
• Measurement of high-Q^2 charged current cross sections in e^+p deep inelastic scattering at HERA
• Measurement of high-Q^2 e^-p neutral current cross sections at HERA and the extraction of xF_3
• Deep inelastic cross-section measurements at large y with the ZEUS detector at HERA
• Measurement of high-Q^2 neutral current deep inelastic e^- p scattering cross sections with a longitudinally polarised electron beam at HERA
• Measurement of charged current deep inelastic scattering cross sections with a longitudinally polarised electron beam at HERA
• Measurement of high-Q^2 charged current deep inelastic scattering cross sections with a longitudinally polarised positron beam at HERA
• Charm quark mass dependence in a global QCD analysis
• Measurement of high-Q2 neutral current deep inelastic e+p scattering cross sections with a longitudinally polarised positron beam at HERA

Cited by in corpus (28)

• Parton distributions from high-precision collider data
• New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
• The Structure of the Proton in the LHC Precision Era
• The PDF4LHC21 combination of global PDF fits for the LHC Run III
• Parton distributions and lattice QCD calculations: toward 3D structure
• Imaging the nucleus with high-energy photons
• Snowmass 2021 whitepaper: Proton structure at the precision frontier
• Hadron structure in high-energy collisions
• Gluon quasidistribution function at one loop
• The x-dependence of hadronic parton distributions: A review on the progress of lattice QCD
• Global analysis of the Sivers functions at NLO+NNLL in QCD
• Information field based global Bayesian inference of the jet transport coefficient
• A new simple PDF parametrization: improved description of the HERA data
• On the power divergence in quasi gluon distribution function
• Mapping the sensitivity of hadronic experiments to nucleon structure
• Updating and Optimizing Error PDFs in the Hessian Approach. Part II
• Extracting jet transport coefficient via single hadron and dihadron productions in high-energy heavy-ion collisions
• Charting the coming synergy between lattice QCD and high-energy phenomenology
• A New Method for Reducing PDF Uncertainties in the High-Mass Drell-Yan Spectrum
• $\gamma$-hadron spectra in p + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Determining the helicity structure of the nucleon at the Electron Ion Collider in China
• Planar ringlike vortices
• Reduction of PDF uncertainty in the measurement of the weak mixing angle at the ATLAS experiment
• Effects of next-to-leading order DGLAP evolution on generalized parton distributions of the proton and deeply virtual Compton scattering at high energy
• Impact of LHCb 13 TeV $W$ and $Z$ pseudo-data on the Parton Distribution Functions
• Reduction of the electroweak correlation in the PDF updating by using the forward-backward asymmetry of Drell-Yan process
• Impact of Beauty and Charm H1-ZEUS Combined Measurements on PDFs and Determination of the Strong Coupling
• The impact of ATLAS and CMS single differential top-quark pair measurements at $\sqrt{s}=8$ TeV to CTEQ-TEA PDFs