@article{oai:ynu.repo.nii.ac.jp:00004164,
 author = {Papavassiliou, Joannis and Philippides, Kostas and Sasaki, Ken},
 issue = {7},
 journal = {Physical Review D},
 month = {Apr},
 note = {We show that in the framework of the pinch technique the universal part of the r parameter can bemeaningfully defined, beyond one loop. The universal part so obtained satisfies the crucial requirements ofgauge independence, finiteness, and process independence, even when subleading contributions of the topquark are included. The mechanism which enforces the aforementioned properties is explained in detail, andseveral subtle field theoretical issues are discussed. Explicit calculations of the subleading two-loop correctionsof order O(G2μm22tMZ) are carried out in the context of an SU(2) model, with Mw=Mz, and various intermediateand final results are reported.},
 pages = {3942--3961},
 title = {Two-loop electroweak corrections to the ρ parameter beyond the leading approximation},
 volume = {53},
 year = {1996}
}