Two-loop electroweak fermionic corrections to sin^2 theta_{eff}^{b anti-b}

@article{Awramik2008TwoloopEF,
  title={Two-loop electroweak fermionic corrections to sin^2 theta_\{eff\}^\{b anti-b\}},
  author={M. Awramik and M. Czakon and A. Freitas and B. Kniehl},
  journal={Nuclear Physics},
  year={2008}
}
We present the first calculation of the two-loop electroweak fermionic correction to the flavour-dependent effective weak-mixing angle for bottom quarks, sin^2 theta_{eff}^{b anti-b}. For the evaluation of the missing two-loop vertex diagrams, two methods are employed, one based on a semi-numerical Bernstein-Tkachov algorithm and the second on asymptotic expansions in the large top-quark mass. A third method based on dispersion relations is used for checking the basic loop integrals. We find… Expand
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