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Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions | | A.D. Martin
; W.J. Stirling
; R.S. Thorne
; G. Watt
; | | Date: |
15 Jul 2010 | | 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. | | Source: | arXiv, 1007.2624 | | Services: | Forum | Review | PDF | Favorites | |
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