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We discuss the program EXP used to automate the successive application of asymptotic expansions to Feynman diagrams. We focus on the generation of the relevant subgraphs and the determination of the topologies for the remaining integrals. Both tasks can be solved by using backtracking-type recursive algorithms. In addition, an application of EXP is… (More)

For the vertex corrections to the partial decay rate ?(Z ! b b) involving the top quark only the leading terms of order s in the 1=M t expansion are known. In this work we compute the missing next-to-leading corrections. They turn out to be equally important as the leading term and therefore have to be included into an O(s) analysis to arrive at reliable… (More)

We present results for the three-loop top quark contributions to the ρ parameter in the limit of large top quark mass. The simultaneous dependence on the mass of the Higgs boson M H and the mass of the top quark m t is obtained from expansions in the range of M H around m t and in the limit M H ≫ m t. In combination with the previous result for M H = 0 the… (More)

Corrections of O(α 2 s) to the decay of the top quark into a W boson and a bottom quark are calculated. The method is based on an expansion of the top quark propa-gator for small external momentum, q, as compared to the top quark mass, M t. The physical point q 2 = M 2 t is reached through Padé approximations. The described method allows to take effects… (More)

In this article two-loop QED corrections to the muon decay and corrections of order αs to the semileptonic decay of the bottom quark are considered. We compute the imaginary part of the four-loop diagrams contributing to the corresponding fermion propagator in the limit of small external momentum. The on-shell condition is obtained with the help of a… (More)

- J. D. van der Bij, Konstantin Chetyrkin, Maik Faisst, G. Jikia, Thomas Seidensticker
- 2000

We present analytical results for the leading contributions of the top quark to the electroweak ρ parameter at order G 3

- Karoline A Ostrowski, Dennis Vogelsang, Thomas Seidensticker, Andreas J. Vorholt
- Chemistry
- 2016

A new tandem catalytic process was designed and developed as a tool for the direct conversion of the widely available feedstock 2,7-octadienol into an α,ω-diester. This innovative auto-tandem catalysis is atom efficient and consists of three consecutive palladium-catalysed reactions: ether formation, ether carbonylation and alkoxycarbonylation. By using the… (More)

We present results for the three-loop top quark contributions to the ρ parameter in the limit of large top quark mass. The simultaneous dependence on the mass of the Higgs boson M H and the mass of the top quark m t is obtained from expansions in the range of M H around m t and in the limit M H ≫ m t. In combination with the previous result for M H = 0 the… (More)

- Arno Behr, Nils Rentmeister, Thomas Seidensticker, Jonas Vosberg, Stephan Peitz, Dietrich Maschmeyer
- Chemistry, an Asian journal
- 2014

The unique linear linkage of isobutene to generate highly valuable C8 precursors for plasticizers is feasible by using special nickel catalysts. (4-Cyclooctene-1-yl)(1,1,1,5,5,5-hexafluoro-2,4-acetylacetonato)nickel and aluminum-alkyl-activated nickel acetylacetonates produce isobutene dimers with high selectivities of up to 95%. Moreover, selectivity for… (More)

- Michael A R Meier, Jürgen O. Metzger, +15 authors Dorothee Anne Quinzler
- 2013

s of lectures 19 Abstracts of posters 55s of posters 55 List of participants 89