Variable-Flavor-Number Scheme in Analysis of Heavy-Quark Electro-Production Data
Abstract
We check the impact of the factorization scheme employed in the calculation of the heavy-quark deep-inelastic scattering (DIS) electro-production on the PDFs determined in the NNLO QCD analysis of the world inclusive neutral-current DIS data combined with the ones on the neutrino-nucleon DIS di-muon production and the fixed-target Drell-Yan process. The charm-quark DIS contribution is calculated in the general-mass variable-flavor-number (GMVFN) scheme: At asymptotically large values of the momentum transfer it is given by the zero-mass 4-flavor scheme and at the value of equal to the charm-quark mass it is smoothly matched with the 3-flavor scheme using the Buza-Matiounine-Smith-van Neerven prescription. The PDFs obtained in this variant of the fit are very similar to the ones obtained in the fit with a 3-flavor scheme employed. Our 5-flavor PDFs derived from the 3-flavor ones using the NNLO matching conditions are used to calculate the rates of and production at the Tevatron collider and the LHC at NNLO.
Keywords
Cite
@article{arxiv.0908.3128,
title = {Variable-Flavor-Number Scheme in Analysis of Heavy-Quark Electro-Production Data},
author = {S. Alekhin and J. Blümlein and S. Klein and S. Moch},
journal= {arXiv preprint arXiv:0908.3128},
year = {2009}
}
Comments
5 pages, Proc. of DIS09, Madrid, April, 2009