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


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Article Info

DATE

2010-10-19

AUTHORS

A. D. Martin, W. J. Stirling, R. S. Thorne, G. Watt

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 mc and mb 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 αS 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Q^{2}/m_{b}^{2}$\end{document} 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Zb\bar{b}$\end{document} production and similar processes. More... »

PAGES

51-72

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    http://scigraph.springernature.com/pub.10.1140/epjc/s10052-010-1462-8

    DOI

    http://dx.doi.org/10.1140/epjc/s10052-010-1462-8

    DIMENSIONS

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    28 schema:description 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 mc and mb 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 αS 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Q^{2}/m_{b}^{2}$\end{document} 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$Zb\bar{b}$\end{document} production and similar processes.
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    36 LHC
    37 MB
    38 MC
    39 MSTW
    40 NLO
    41 PDF
    42 PDF analysis
    43 PDF sets
    44 PDF uncertainties
    45 Tevatron
    46 analysis
    47 bottom quark mass
    48 calculations
    49 cases
    50 charm
    51 cross sections
    52 cut
    53 dependence
    54 differences
    55 distribution
    56 example
    57 experimental measurements
    58 fit
    59 global PDF analysis
    60 heavy quark mass
    61 heavy quark mass dependence
    62 impact
    63 input pdf
    64 large logarithms
    65 logarithm
    66 mass
    67 mass dependence
    68 measurements
    69 need
    70 parton distributions
    71 process
    72 production
    73 quarks
    74 range
    75 scheme
    76 sections
    77 sensitivity
    78 set
    79 significant differences
    80 similar processes
    81 total cross sections
    82 uncertainty
    83 use
    84 values
    85 version
    86 wide range
    87 α′
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