Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of changes of variable flavor number scheme on parton
  distribution functions and predicted cross sections   I consider variations in the definitions, at next-to-leading order (NLO) and
at next-to-next-to leading order (NNLO), of a General-Mass Variable Flavour
Number Scheme (GM-VFNS) for heavy flavour structure functions. I also define a
new "optimal" scheme choice improving the smoothness of the transition from one
flavour number to the next. I investigate the variation of the structure
function for a fixed set of parton distribution functions (PDFs) and also the
change in the PDFs when a new MSTW2008-type global fit to data is performed for
each GM-VFNS. At NLO the parton distributions, and predictions using them at
hadron colliders, can vary by 2-3% from the mean value. At NNLO there is far
more stability with varying GM-VFNS definition, and changes in PDFs and
predictions are less than 1%, with most variation at very small x values.
Hence, mass-scheme variation is an additional and significant source of
uncertainty when considering parton distributions, but as with all perturbative
uncertainties, it diminishes quickly as higher orders are included.

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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat