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Scalar Correlator at O(alpha_s^4), Higgs Decay into b-quarks and Bounds on the Light Quark Masses
P. A. Baikov, K. G. Chetyrkin, J. H. Kühn
We compute, for the first time, the absorptive part of the massless correlator of two quark scalar currents in five loops. As physical applications we consider the O(alpha_s^4) cor…
QCD Decoupling at Four Loops
K. G. Chetyrkin, J. H. Kühn, C. Sturm
We present the matching condition for the strong coupling contant alpha_s at a heavy quark threshold to four loops in the modified minimal subtraction scheme. Our results lead to f…
Electron-positron annihilation into three pions and the radiative return
Henryk Czyz, Agnieszka Grzelinska, Johann H. Kuhn +1
The Monte Carlo event generator PHOKHARA, which simulates hadron and muon production at electron-positron colliders through radiative return, has been extended to final states with…
Electroweak corrections to top-quark pair production in quark--antiquark annihilation
J. H. Kuhn, A. Scharf, P. Uwer
Top-quark physics plays an important role at hadron colliders such as the Tevatron at Fermilab or the LHC at CERN. Given the planned precision at these colliders, precise theoretic…