The Gluonic Operator Matrix Elements at O(α_s^2) for DIS Heavy Flavor Production

Abstract

We calculate the $O({\alpha }_s^2)$ gluonic operator matrix elements for the twist--2 operators, which contribute to the heavy flavor Wilson coefficients in unpolarized deeply inelastic scattering in the region $Q^2\gg m^2$, up to the linear terms in the dimensional parameter $\epsilon$, ($D=4+\epsilon$). These quantities are required for the description of parton distribution functions in the variable flavor number scheme (VFNS). The $O({\alpha }_s^2\epsilon )$ terms contribute at the level of the $O({\alpha }_s^3)$ corrections through renormalization. We also comment on additional terms, which have to be considered in the fixed (FFNV) and variable flavor number scheme, adopting the $\overline{\mathrm{MS}}$ scheme for the running coupling constant.

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