Name: Vladyslav Shtabovenko Date: 11/22/16-12:14:24 PM Z

Announcement: FeynHelpers 1.0 released!

Dear FeynCalc users,

I’m very happy to announce that my FeynCalc add-on “FeynHelpers”
is now official. It is an interface that seamlessly integrates
the library of analytic results for scalar 1-loop integrals with up
to 4 legs from Package-X (packagex.hepforge.org) and the IBP-reduction
engine of FIRE (bitbucket.org/feynmanIntegrals/fire) into FeynCalc.

FeynHelpers makes it very simple to obtain fully analytic results for
1-loop amplitudes, while you can still work in the familiar FeynCalc
environment. Furthermore, one can use IBP-techniques when working with
multi-loop amplitudes in a much more convenient way.

The accompanying preprint that also serves as a manual (at least for now)
is available here:

https://arxiv.org/abs/1611.06793

The installation is very easy. If you have an older version of FeynCalc
installed,
you need to update to version 9.2 first:

Import[“https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m”]
InstallFeynCalc[]

Then in the same session you evaluate

Import[“https://raw.githubusercontent.com/FeynCalc/feynhelpers/master/install.m”]
InstallFeynHelpers[]

and after restarting the kernel FeynHelpers is ready to use

$LoadAddOns={“FeynHelpers”}
<<FeynCalc`

The examples described in the preprint are bundled as Mathematica
notebooks with
the source files of the document:

https://arxiv.org/e-print/1611.06793v1

However, they are also shipped with FeynHelpers as .m files under
FeynCalc/AddOns/FeynHelpers/Examples,
see also <https://github.com/FeynCalc/feynhelpers/tree/master/Examples>

Please notice that the QED renormalization example and the QCD/NRQCD
vertex matching example require
custom FeynArts models created with FeynRules. To run those examples you
need to first install
FeynRules from

http://feynrules.irmp.ucl.ac.be/

and run the .m files

FeynCalc/Examples/FeynRules/QED/GenerateModelQED.m
FeynCalc/Examples/FeynRules/QCDBGF/GenerateModelQCDBGF.m

they will automatically create FeynArts models and copy them to
FeynCalc/FeynArts/Models.

The code of the interface is available here

https://github.com/FeynCalc/feynhelpers

As in case of FeynCalc, there are two branches:

* stable for releases and bugfixes
* master for not development and not so well tested new features

When you install with InstallFeynHelpers[] you get the stable version.
To obtain the
development version, use
InstallFeynHelpers[InstallFeynHelpersDevelopmentVersion -> True]

You can post questions regarding FeynHelpers on this mailing list.

Have fun!

Cheers,
Vladyslav