Abstract:The one-loop corrections to the weak mixing angle sin 2 θ b eff , derived from the Zbb vertex, are known since 1985. It took another 30 years to calculate the complete electroweak two-loop corrections to sin 2 θ b eff . The main obstacle was the calculation of the O(700) bosonic two-loop vertex integrals with up to three mass scales, at s = M 2 Z . We did not perform the usual integral reduction and master evaluation, but chose a completely numerical approach, using two different calculational chains. One meth… Show more
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