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 $Q$ it is given by the zero-mass 4-flavor scheme and at the value of $Q$ 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 $W^{\pm }/Z$ and $t\bar{t}$ production at the Tevatron collider and the LHC at NNLO.

5 pages, Proc. of DIS09, Madrid, April, 2009

References in corpus (5)

• Parton distributions for the LHC
• Measuring the running top-quark mass
• The 3-, 4-, and 5-flavor NNLO Parton from Deep-Inelastic-Scattering Data and at Hadron Colliders
• Measurement of the Charm and Beauty Structure Functions using the H1 Vertex Detector at HERA
• Including heavy flavour production in PDF fits

Cited by in corpus (8)

• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• Combination of Measurements of Inclusive Deep Inelastic $e^{\pm }p$ Scattering Cross Sections and QCD Analysis of HERA Data
• W physics at the LHC with FEWZ 2.1
• Measurement of the D* Meson Production Cross Section and F_2^{ccbar}, at High Q^2, in ep Scattering at HERA
• Probing the top quark chromoelectric and chromomagnetic dipole moments in single top $tW$-channel at the LHC
• Charm, Beauty and Top at HERA
• BFKL equation with running QCD coupling and HERA data
• The small x gluon and b\bar{b} production at the LHC