Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 13: QCD (Theorie) 3

T 13.2: Talk

Thursday, March 1, 2012, 17:00–17:15, VG 3.103

Two loop corrections for single top quark production — •Mohammad Assadsolimani, Philipp Kant, Bas Tausk, and Peter Uwer — Institut für Physik - AG PEP, Humboldt-Universität zu Berlin

Single-top-quark production enables us to study the nature of the weak interaction and to measure directly the Cabibbo-Kobayashi-Maskawa matrix element V_tb. For a detailed analysis of this process, precise theoretical predictions are required. The results available in the literature include the leading-order QCD corrections which are found to be small. Since in leading-order QCD no color exchange between the two incoming quarks is allowed, one can expect that higher-order QCD corrections may give a significant contribution. It is thus important to take these corrections into account. One important ingredient to extend the accuracy of the available predictions are the two-loop amplitudes. In this talk we discuss the methods used to assess the two-loop corrections and show first results for specific color configuration.