Calculation of two-loop QCD corrections for hadronic single top-quark production in the t channel

In this article we discuss the calculation of single top-quark production in the t channel at two-loop order in QCD. In particular we present the decomposition of the amplitude according to its spin and colour structure and present complete results for the two-loop amplitudes in terms of master integrals. For the vertex corrections compact analytic expressions are given. The box contributions are implemented in a publicly available C program.Comment: Latex, 36 pages; v2: minor modifications, title change

Infrared singularities in one-loop amplitudes

In this talk we discuss a purely numerical approach to next-to-leading order calculations in QCD. We present a simple formula, which provides a local infrared subtraction term for the integrand of a one-loop amplitude. In addition we briefly comment on local ultraviolet subtraction terms and on the required deformation of the contour of integration.Comment: 6 pages, talk given at the conference "Loops and Legs", Woerlitz, 201

Efficiency improvements for the numerical computation of NLO corrections

In this paper we discuss techniques, which lead to a significant improvement of the efficiency of the Monte Carlo integration, when one-loop QCD amplitudes are calculated numerically with the help of the subtraction method and contour deformation. The techniques discussed are: holomorphic and non-holomorphic division into sub-channels, optimisation of the integration contour, improvement of the ultraviolet subtraction terms, importance sampling and antithetic variates in loop momentum space, recurrence relations.Comment: 34 pages, version to be publishe

Kulturanthropologie des Textilen an der Technischen Universität Dortmund

Die Kulturanthropologie des Textilen an der Technischen Universität Dortmund präsentiert die Studiengänge Lehramt Textilgestaltung sowie Kulturanalyse und Kulturvermittlung sowie das Nebenfach Kulturanthropologie des Textilen mit Studienprojekten, Exkursionen, Auslandskooperationen, der Fachschaft und Studiensammlungen. Es vereint wissenschaftliche, didaktische und gestalterische Ansätze und Betrachtungen auf dem Feld des Vestimentären und der materiellen Kultur