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19952026
most citedEstimate of BR(B -> X_s gamma) at O(alpha_s^2)

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hep-ph2005

Four-Loop Decoupling Relations for the Strong Coupling

Y. Schroder, M. Steinhauser

We compute the matching relation for the strong coupling constant within the framework of QCD up to four-loop order. This allows a consistent five-loop running (once the functi…

hep-ph2005

Four-Loop Singlet Contribution to the Parameter

Y. Schroder, M. Steinhauser

We compute the four-loop contribution to the electroweak parameter induced by the singlet diagrams of the -boson self-energy. The numerical impact on the weak mixing angle a…