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Single Scale Tadpoles and O(GF mt^2 as^3) Corrections to the rho Parameter
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We present a new set of high precision numerical values of four-loop single-scale vacuum integrals, which we subsequently use to obtain the non-singlet corrections to the rho parameter at O(GF mt^2 as^3). Our result for Delta rho is in agreement with the recent calculation [1].
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