New data for the total cross section Ïƒ(e+eâˆ’ â†’ hadrons) in the charm and bottom threshold region are combined with an improved theoretical analysis, which includes recent four-loop calculations, toâ€¦ (More)

One of the most troublesome contributions to the NNLO QCD corrections to BÌ„ â†’ XsÎ³ originates from three-loop matrix elements of four-quark operators. A part of this contribution that is proportionalâ€¦ (More)

We consider the production of intermediate-mass CP-even and CP-odd Higgs bosons in proton-proton and proton-anti-proton collisions. We extend the recently published results for the completeâ€¦ (More)

In the recent years there has been an enormous development in the evaluation of higher order quantum corrections. An essential ingredient in the practical calculations is provided by vacuum diagrams,â€¦ (More)

The non-diagonal correlators of vector and scalar currents are considered at threeloop order in QCD. The full mass dependence is computed in the case where one of the quarks is massless and the otherâ€¦ (More)

The next-to-leading order (NLO) QCD corrections to the production and decay rate of a Higgs boson are computed within the framework of the Minimal Supersymmetric Standard Model (MSSM). Theâ€¦ (More)

In this paper we compare recent experimental data for the total cross section Ïƒ(e+eâˆ’ â†’ hadrons) with the up-to-date theoretical prediction of perturbative QCD for those energies where perturbationâ€¦ (More)

We study the problem of solving integration-by-parts recurrence relations for a given class of Feynman integrals which is characterized by an arbitrary polynomial in the numerator and arbitraryâ€¦ (More)

We present results for the relation between a heavy quark mass defined in the on-shell and minimal subtraction (MS[over Â¯]) scheme to four-loop order. The method to compute the four-loop on-shellâ€¦ (More)

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 Î² function is available toâ€¦ (More)