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The effective electroweak mixing angle sin²θ_(eff) with two-loop fermionic contributions
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The effective electroweak mixing angle sin²θ_(eff) with two-loop fermionic contributions
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We present the results from a calculation of the full electroweak two-loop fermionic contributions to the effective leptonic mixing angle of the $Z$ boson, $\sin^2\theta_{eff}$, in the Standard Model. On-shell renormalization and analytic calculations are performed for the three-point vertex functions at zero external momenta, whereas irreducible three-point integrals for non-vanishing external momenta are evaluated semi-analytically applying two different methods. Comparisons with a previous calculation show complete agreement.
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