Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions

Abstract

We study the sensitivity of our recent MSTW 2008 NLO and NNLO PDF analyses to the values of the charm- and bottom-quark masses, and we provide additional public PDF sets for a wide range of these heavy-quark masses. We quantify the impact of varying m_c and m_b on the cross sections for W, Z and Higgs production at the Tevatron and the LHC. We generate 3- and 4-flavour versions of the (5-flavour) MSTW 2008 PDFs by evolving the input PDFs and alpha_S determined from fits in the 5-flavour scheme, including the eigenvector PDF sets necessary for calculation of PDF uncertainties. As an example of their use, we study the difference in the Z total cross sections at the Tevatron and LHC in the 4- and 5-flavour schemes. Significant differences are found, illustrating the need to resum large logarithms in Q^2/m_b^2 by using the 5-flavour scheme. The 4-flavour scheme is still necessary, however, if cuts are imposed on associated (massive) b-quarks, as is the case for the experimental measurement of Z b bbar production and similar processes.

40 pages, 11 figures. Grids can be found at http://projects.hepforge.org/mstwpdf/ and in LHAPDF V5.8.4. v2: version published in EPJC

References in corpus (78)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Parton distributions for the LHC
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• New parton distributions for collider physics
• Implications of CTEQ global analysis for collider observables
• The p_T Spectrum in Heavy-Flavour Hadroproduction
• Combined Measurement and QCD Analysis of the Inclusive ep Scattering Cross Sections at HERA
• Matching NLO QCD and parton showers in heavy flavour production
• Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
• The three loop relation between the \bar {MS} and the pole quark masses
• Deep-Inelastic Inclusive ep Scattering at Low x and a Determination of alpha_s
• Improved Measurement of the $\bar{d}/\bar{u}$ Asymmetry in the Nucleon Sea
• A first unbiased global NLO determination of parton distributions and their uncertainties
• Measurement of the proton and deuteron structure functions, F2p and F2d, and of the ratio sigma(L)/sigma(T)
• Heavy Quark Effective Theory beyond Perturbation Theory: Renormalons, the Pole Mass and the Residual Mass Term
• The Pole Mass of The Heavy Quark. Perturbation Theory and Beyond
• Measurement of the neutral current cross section and F2 structure function for deep inelastic e+p scattering at HERA
• The relation between the $\overline{\mathrm{MS}}$ and the on-shell quark mass at order ${\alpha }_s^3$
• Measurement of the inclusive jet cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$
• Charm electroproduction viewed in the variable-flavour number scheme versus fixed-order perturbation theory
• Charm and Bottom Quark Masses: an Update
• The 3-, 4-, and 5-flavor NNLO Parton from Deep-Inelastic-Scattering Data and at Hadron Colliders
• Higgs Radiation off Bottom Quarks at the Tevatron and the LHC
• Precise Measurement of Dimuon Production Cross-Sections in muon neutrino Fe and muon antineutrino Fe Deep Inelastic Scattering at the Tevatron
• An Ordered Analysis of Heavy Flavour Production in Deep Inelastic Scattering
• Exclusive Higgs Boson Production with bottom quarks at Hadron Colliders
• Physical Gluons and High $E_T$ Jets
• Measurement and QCD Analysis of Neutral and Charged Current Cross Sections at HERA
• Dynamical NNLO parton distributions
• Update of Parton Distributions at NNLO
• A Variable-Flavour Number Scheme for NNLO
• Dynamical parton distributions of the nucleon and very small-x physics
• Precise Measurement of Neutrino and Anti-neutrino Differential Cross Sections
• Next-to-leading-order predictions for t-channel single-top production at hadron colliders
• Radiative corrections to Zb{\bar b} production
• Mellin Moments of the {$O({\alpha }_s^3$)} Heavy Flavor Contributions to unpolarized Deep-Inelastic Scattering at $Q^2\gg m^2$ and Anomalous Dimensions
• Uncertainty induced by QCD coupling in the CTEQ global analysis of parton distributions
• Measurement of Neutral and Charged Current Cross Sections in Electron-Proton Collisions at High Q^2
• Measurement of D*+- production and the charm contribution to F_2 in deep inelastic scattering at HERA
• Measurement of the Inclusive Jet Cross Section using the k_T algorithm in pp-bar Collisions at sqrt(s) = 1.96 TeV with the CDF II Detector
• Measurement of the shape of the boson rapidity distribution for p\bar{p}-> Z/gamma*-> e+e- +X events produced at sqrt(s) of 1.96 TeV
• Heavy-quark correlations in deep-inelastic electroproduction
• Accurate Measurement of F2d/F2p and Rd-Rp
• MRST partons generated in a fixed-flavour scheme
• Measurement of the Charm and Beauty Structure Functions using the H1 Vertex Detector at HERA
• Gluon condensates and c, b quark masses from quarkonia ratios of moments
• Measurement of F_2^ccbar and F_2^bbbar at High Q^2 using the H1 Vertex Detector at HERA
• Measurement of D^(*+-) Meson Production and F_2^c in Deep-Inelastic Scattering at HERA
• Measurement of F_2^{c\bar{c}} and F_2^{b\bar{b}} at Low Q^2 and x using the H1 Vertex Detector at HERA
• Inclusive $D^0$ and $D^{\ast }\pm$ Production in Deep Inelastic $ep$ Collisions at HERA
• Inclusive jet cross sections in the Breit frame in neutral current deep inelastic scattering at HERA and determination of alpha_s
• Measurement of D*+- production in deep inelastic ep scattering at HERA
• Charm quark and D^* cross sections in deeply inelastic scattering at DESY HERA
• W- and Z-boson production with a massive bottom-quark pair at the Large Hadron Collider
• Measurement of the Forward-Backward Charge Asymmetry from W --> e nu Production in p anti-p Collisions at s**(1/2) = 1.96 TeV
• The impact of PDF and alphas uncertainties on Higgs Production in gluon fusion at hadron colliders
• NLO predictions for t-channel production of single top and fourth generation quarks at hadron colliders
• Measurement of the muon charge asymmetry from W boson decays
• Inclusive-jet and dijet cross sections in deep inelastic scattering at HERA
• Measurement of Inclusive Jet Production in Deep-Inelastic Scattering at High Q^2 and Determination of the Strong Coupling
• Charged-Higgs-boson production at the LHC: NLO supersymmetric QCD corrections
• Order α_s^2 Contributions to charm production in charged-current deep-inelastic lepton-hadron scattering
• High-Q^2 neutral current cross sections in e^+p deep inelastic scattering at sqrt{s}=318 GeV
• Soft Gluon Resummation for Heavy Quark Electroproduction
• NLO QCD corrections to W boson production with a massive b-quark jet pair at the Fermilab Tevatron p-pbar collider
• Measurement of charm and beauty production in deep inelastic ep scattering from decays into muons at HERA
• 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
• Inclusive production of a Higgs or Z boson in association with heavy quarks
• PQCD Formulations with Heavy Quark Masses and Global Analysis
• Charm Quark Mass from Inclusive Semileptonic B Decays
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• NLO QCD corrections to Z b anti-b production with massive bottom quarks at the Fermilab Tevatron
• Heavy flavor contributions to the Drell-Yan cross section
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• HERAPDF fits including $F_2$(charm) data
• Determination of the longitudinal proton structure function FL at low Q2 at HERA
• The Effect of Variable Flavour Number Scheme Variations on PDFs and Cross Sections

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