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We present the first calculation of the two-loop electroweak fermionic correction to the flavour-dependent effective weak-mixing angle for bottom quarks, sin2θeffbb¯. 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...
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