====== TTP06-30 Standard and ε-finite master integrals for the ρ parameter ====== We have constructed an ε-finite basis of master integrals for all new types of one-scale tadpoles which appear in the calculation of the four-loop QCD corrections to the electroweak ρ-parameter. Using transformation rules from the ε-finite basis to the standard minimal-number-of-lines basis, we obtain as a by-product analytical expressions for few leading terms of the ε-expansion of all members of the standard basis. The new master integrals have been computed with the help of the Pade method and by use of difference equations independently. |**M. Faisst, P. Maierhöfer and C. Sturm** | |** Nucl. Phys. B766 (2007) (246-268) ** | | {{preprints:2006:ttp06-30.pdf|PDF}} {{preprints:2006:ttp06-30.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0611244|arXiv]] [[http://ttp.kit.edu/Progdata/ttp06/ttp06-30|Programs and Data]] | | |