152 research outputs found
A Mathematica Interface for FormCalc-generated Code
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
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
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
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
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
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
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
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
- …