476 citations · 698 across the 5 of their papers we have counts for
9 papers · 1 filter
New Results in Four and Five Loop QED calculations
P. A. Baikov, K. G. Chetyrkin, C. Sturm
We report on two recent multiloop results in QED: (i) the four-loop corrections to the conversion relations between the QED charge renormalized in the on-shell and MS-bar schemes;…
Hadronic Z- and tau-Decays in Order alpha_s^4
P. A. Baikov, K. G. Chetyrkin, J. H. Kühn
Using recently developed methods for the evaluation of five-loop amplitudes in perturbative QCD, corrections of order alpha_s^4 for the cross section of electron-positron annihilat…
Towards NNLO Accuracy in the QCD Sum Rule for the Kaon Distribution Amplitude
K. G. Chetyrkin, A. Khodjamirian, A. A. Pivovarov
We calculate the and gluon radiative corrections to the QCD sum rule for the first Gegenbauer moment of the kaon light-cone distribution amplitude. The…
A closed analytical formula for two-loop massive tadpoles with arbitrary tensor numerators
K. G. Chetyrkin
Using the integration by parts method we derive a closed analytical expression for the result of the integration of an arbitrary dimensionally regulated tadpole diagram composed of…
Three-loop Three-Linear Vertices and Four-Loop MOM beta functions in massless QCD
K. G. Chetyrkin, A. Retey
In this paper we present a full set of 2- and 3-point functions for massless QCD at three-loop order in the MSbar scheme. The vertex functions are evaluated at the asymmetric point…
Quark mass effects to σ(e^+e^- -> hadrons) at O(α_s^3)
K. G. Chetyrkin, R. Harlander, J. H. Kuehn
The calculation of the quartic mass terms at order α_s^3 to the hadronic R ratio is described. It is based on the operator product expansion for the quark current correlator, combi…