A Variable Flavour Number Scheme at NNLO

Abstract

I present a formulation of a Variable Flavour Number Scheme for heavy quarks that is implemented up to NNLO in the strong coupling constant and may be used in NNLO global fits for parton distributions.

Comments: 4 pages, 6 figures included as .ps files. To appear in proceedings of DIS05, XIII International Workshop on Deep Inelastic Scattering