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Thus, from the beginning CompHEP has a problem of batch calculations. From the other side, long-time calculations should be done in the non-interactive regime. According to this, the packages were created as a menu driven user friendly programs for calculations in the interactive mode. The main idea prescribed into the packages is to make available passing on from the Lagrangian to the final distributions effectively with a high level of automation. CompHEP/ CalcHEP are packages for automatic calculations of elementary particle decay and collision properties in the lowest order of perturbation theory. We present Version 9 of the Feynman-diagram calculator Form Calc and a flexible new suite of shell scripts and Mathematica packages based on Form Calc, which can be adapted and used as a template for calculations.ĬalcHEP is a clone of the CompHEP project which is developed by the author outside of the CompHEP group. International Nuclear Information System (INIS) Such calculations are important for obtaining higher order relativistic corrections to the NRQCD cross-sections and decay rates where the covariant projector approach is not always applicable. We show that despite of being a high energy physics tool, Feyn Calc is also well suitable for situations, where in the matching the manifest Lorentz covariance of QCD must be broken, such that one has to explicitly distinguish between temporal and spatial components of Lorentz tensors. This talk provides examples for using Feyn Calc in heavy quarkonium physics, focussing on matching calculations between QCD and non-relativistic QCD (NRQCD), a well established effective field theory of QCD that is used to describe production and decay of heavy quarkonia.
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We present the new version 9 of the Mathematica package Feyn Calc, a useful tool for symbolic evaluation of Feynman diagrams and algebraic calculations in QFT. 10, 10407 Berlin (Germany) Orellana, Frederik [Technical University of Denmark, Anker Engelundsvej 1, Building 101A, 2800 Kgs. 1, 85747 Garching (Germany) Mertig, Rolf [GluonVision GmbH, Boetzowstr. Shtabovenko, Vladyslav [Technische Universitaet Muenchen, Physik-Department T30f, James-Franck-Str. Energy Technology Data Exchange (ETDEWEB)
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