Heavy flavor operator matrix elements at O ( a 3 s )

The Gluonic Operator Matrix Elements at O ( α 2 s ) for DIS Heavy Flavor Production

We calculate the O(αs) 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 Q2 ≫ m2, up to the linear terms in the dimensional parameter ε, (D = 4+ε). These quantities are required for the description of parton distribution functions in the variable flavor number scheme (VFNS...

O(αs) Heavy Flavor Contributions to Unpolarized Deep-Inelastic Scattering at Q ≫ m and Anomalous Dimensions

We calculate the O(αs) heavy flavor contributions to the Wilson coefficients of the structure function F2(x,Q 2) and the massive operator matrix elements (OMEs) for the twist–2 operators of unpolarized deeply inelastic scattering in the region Q2 ≫ m2. The massive Wilson coefficients are obtained as convolutions of massive OMEs and the known light flavor Wilson coefficients. We also compute the...

) Heavy Flavor Contributions

In deep-inelastic processes the heavy flavor Wilson coefficients factorize for Q2 ≫ m2 into the light flavor Wilson coefficients of the corresponding process and the massive operator matrix elements (OMEs). We calculate the O(αs) and O(α 3 s) massive OME for the flavor non-singlet transversity distribution. At O(αs) the OME is obtained for general values of the Mellin variable N , while at O(αs...

Heavy Flavor DIS Wilson coefficients in the asymptotic regime

We report on results for the heavy flavor contributions to F2(x,Q ) in the limit Q ≫ m at NNLO. By calculating the massive 3–loop operator matrix elements, we account for all but the power suppressed terms in m/Q. Recently, the calculation of fixed Mellin moments of all 3–loop massive operator matrix elements has been finished. We present new all–N results for the O(nf )–terms, thereby confirmi...

Two–Loop Massive Operator Matrix Elements for Unpolarized Heavy Flavor Production to O(ǫ)

We calculate the O(αs) massive operator matrix elements for the twist–2 operators, which contribute to the heavy flavor Wilson coefficients in unpolarized deeply inelastic scattering in the region Q2 ≫ m2, up to the O(ε) contributions. These terms contribute through the renormalization of the O(αs) heavy flavor Wilson coefficients of the structure function F2(x,Q 2). The calculation has been pe...

arXiv:0803.0273 [hep-ph] Two–Loop Massive Operator Matrix Elements for Unpolarized Heavy Flavor Production to O(ǫ)