152 research outputs found

    A Mathematica Interface for FormCalc-generated Code

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    This note describes a Mathematica interface for Fortran code generated by FormCalc. The interfacing code is set up automatically so that only minuscule changes in the driver files are required. The interface makes a function to compute the cross-section or decay rate available in Mathematica. This function depends on the model parameters chosen for interfacing in the Fortran code.Comment: 6 page

    Extensions in FormCalc 5.3

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    We present a new tool for editing Feynman diagrams as well as several extensions in version 5.3 of the package FormCalc for the calculation of Feynman diagrams.Comment: 8 pages, contribution to the proceedings of the ACAT workshop, Amsterdam, April 23-27, 200

    Automatic Loop Calculations with FeynArts, FormCalc, and LoopTools

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    This article describes three Mathematica packages for the automatic calculation of one-loop Feynman diagrams: the diagrams are generated with FeynArts, algebraically simplified with FormCalc, and finally evaluated numerically using the LoopTools package. The calculations are performed analytically as far as possible, with results given in a form well suited for numerical evaluation. The latter is straightforward with the utility programs provided by FormCalc (e.g. for translation into Fortran code) and the implementations of the one-loop integrals in LoopTools. The programs are also equipped for calculations in supersymmetric models.Comment: 6 pages, uses axodraw and npb.sty. Talk given at Loops and Legs 2000, Bastei, Germany, April 9-1

    News from FormCalc and LoopTools

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    The FormCalc package automates the computation of FeynArts amplitudes up to one loop including the generation of a Fortran code for the numerical evaluation of the squared matrix element. Major new or enhanced features in Version 5 are: iterative build-up of essentially arbitrary phase-spaces including cuts, convolution with density functions, and uniform treatment of kinematical variables. The LoopTools library supplies the one-loop integrals necessary for evaluating the squared matrix element. Its most significant extensions in Version 2.2 are the five-point family of integrals, and complex and alternate versions.Comment: 5 pages, to appear in the proceedings of the 7th International Symposium on Radiative Corrections (RADCOR05), Shonan Village, Japan, 200

    New Developments in FormCalc 8.4

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    We present new developments in FeynArts 3.9 and FormCalc 8.4, in particular the MSSMCT model file including the complete one-loop renormalization, vectorization/parallelization issues, and the interface to the Ninja library for tensor reduction.Comment: 7 pages, proceedings contribution to Loops & Legs 2014, April 27-May 2, 2014, Weimar, German

    Automatized One-Loop Calculations in 4 and D dimensions

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    Two program packages are presented for evaluating one-loop amplitudes. They can work either in dimensional regularization or in constrained differential renormalization. The latter method is found at the one-loop level to be equivalent to regularization by dimensional reduction.Comment: 16 pages, uses amstex and axodraw, 1 eps figur

    Introduction to SARAH and related tools

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    I give in this lecture an overview of the features of the Mathematica package SARAH, and explain how it can be used together with other codes to study all aspects of a BSM model. The focus will be on the description of the analytical calculations which SARAH can perform and how this information is used to generate automatically a spectrum generator based on SPheno. I also summarize the main aspects of the other interfaces to public codes like HiggsBounds/HiggsSignals, FeynArts/FormCalc, CalcHep, MicrOmegas, WHIZARD, Vevacious or MadGraph. The appendix contains a short tutorial about the implementation and usage of a new model.Comment: 16 pages, Lecture given at "Summer School and Workshop on the Standard Model and Beyond", Corfu Summer Institute 2015; v2: moved to PoS styl

    ALHEP symbolic algebra program for high-energy physics

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    ALHEP is the symbolic algebra program for high-energy physics. It deals with amplitudes calculation, matrix element squaring, Wick theorem, dimensional regularization, tensor reduction of loop integrals and simplification of final expressions. The program output includes: Fortran code for differential cross section, Mathematica files to view results and intermediate steps and TeX source for Feynman diagrams. The PYTHIA interface is available. The project website http://www.hep.by/alhep contains up-to-date executables, manual and script examples.Comment: 33 pages, 4 figure
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