M. N. Tentyukov

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A C-program DIANA (DIagram ANAlyser) for the automation of Feynman diagram evaluations is presented. Recent high precision experiments require, on the side of the theory, high-precision calculations resulting in the evaluation of higher loop diagrams in the Standart Model (SM). For specific processes thousands of multiloop Feynman diagrams do contribute,(More)
A method to calculate two-loop self-energy diagrams of the Standard Model is demonstrated. A direct physical application is the calculation of the two-loop electroweak contribution to the anomalous magnetic moment of the muon 1 2 (g − 2) µ. Presently we confine ourselves to a " toy " model with only µ, γ and a scalar particle (Higgs). The algorithm is(More)
A method to calculate two-loop self-energy diagrams of the Standard Model is demonstrated. A direct physical application is the calculation of the two-loop electroweak contribution to the anomalous magnetic moment of the muon 1 2 (g − 2) µ. Presently, we confine ourselves to a " toy " model with only µ, γ and a heavy neutral scalar particle (Higgs). The(More)
Details of recent developments of the Feynman diagram analyzer DIANA (DIagram ANAlyser) are presented. Apart from some discussion about QGRAF and new plotting features, we concentrate on a new sophisticated mechanism of momenta mapping. The C-program DIANA (DIagram ANAlyser) for the automatic Feynman diagram evaluation was first documented in [1] 1.(More)
Non factorizable O(αα s) corrections to the process Z → b ¯ b Abstract We evaluate non factorizable O(αα s) corrections to the process Z → b ¯ b due to the virtual t-quark. All two-loop vertex diagrams with W 's and charged ghosts Φ's are included. They are evaluated in the large top-mass expansion up to the 10 th order. Gluon Bremsstrahlung is taken into(More)
A C-program DIANA (DIagram ANAlyser) for the automatic Feynman diagram evaluation is presented. It consists of two parts: the analyzer of diagrams and the interpreter of a special text manipulating language. This language is used to create a source code for analytical or numerical evaluations and to keep the control of the process in general.