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Vladyslav Shtabovenko
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Updated README.MD
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README.MD

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FeynHelpers is a collection of interfaces that allow you to use other HEP-related tools from your FeynCalc session.
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# Warning
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In the present state FeynHelpers is **NOT READY** for productive use. In particular, you should **NEVER** rely on the results that were obtained solely with FeynHelpers but not checked with any other tools or by hand. However, you are encouraged to report bugs and suggest improvements.
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# Requirements
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FeynHelpers is designed as an add-on for FeynCalc. To use it you need at least FeynCalc 9 and Mathematica 8.
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FeynHelpers is designed as an add-on for FeynCalc. To use it you need at least FeynCalc 9.2 and Mathematica 8.
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# Supported tools
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Tools that are currently supported are
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* FIRE
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* Package-X
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* FIRE 5.2
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* Package-X 2.0
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# Installation
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ImportString[URLFetch["https://raw.githubusercontent.com/FeynCalc/feynhelpers/master/install.m"]]
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InstallFeynCalc[]
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```
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* The automatic installer can also install Package-X for you. It will offer you this possiblity at the end of the installation process
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* If you want to use FIRE, you will need to install the package by hand. It should be possible to load FIRE via
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* The automatic installer can also install Package-X and FIRE for you. It will offer you this possiblity at the end of the installation process
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```
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<< FIRE5`
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```
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## Manual installation
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* Create a directory _FeynHelpers_ inside
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# Usage
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## Loading the add-on
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To load FeynHelpers with FeynCalc, use
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```
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$LoadAddOns={"FeynHelpers"};
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<< FeynCalc`
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```
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## PaXEvaluate
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* PaXEvaluate is a function that fetches analytic expressions for Passarino-Veltman coefficient and scalar functions with up to 3-legs from Package-X.
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* The syntax is `PaxEvaluate[expr,q]`, where `expr` is the expression that you want to evaluate and `l` denotes the loop momentum
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* There are also some options, from which `PaXImplicitPrefactor` is the most important one. It denotes an implicit prefactor of the loop integral, i.e. a prefactor that is not written explicitly but understood. For example, using `FAD[{q, m}]` with `PaXImplicitPrefactor -> 1/(2 Pi)^(4 - 2 Epsilon)` corresponds to entering the integral `\[Integral] d q^D / (2Pi)^D 1/(q^2 - m^2)`, i.e. the usual 1-loop tadpole integral with the "textbook" prefactor.
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Here is an example of evaluating a tadpole integral
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```
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PaXEvaluate[FAD[{q, m}], q, PaXImplicitPrefactor -> 1/(2 Pi)^(4 - 2 Epsilon)]
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```
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## FIREBurn
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Here is an example of IBP-reducing a bubble with propagators in powers
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```
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FIREBurn[FAD[{q, m0, 2}, {q - p, m1, 3}], {q}, {p}]
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```
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For usage information see the accompanying paper and supplied examples.
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# Acknowledgments
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