FeynCalc Forum

Re: FeynArts using FeynCalc (or, ... , FeynCalc using FeynArts)

Rolf Mertig — 2012-05-01T00:32:25+01:00

Hi,
I never liked those strange FeynArts QCD models, so I made my own and
put them into the Models directory of FeynCalc.

Please check also the gggg.m, qcdgluonse1.m and similar

FeynArts using Feyncalc

Reinke Sven Isermann — 2012-04-11T08:44:40+01:00

Hi,

this might be a stupid question but how do I get Feyncalc 8.0.0 beta3 to
evaluate diagrams generated by the patched 3.4 Feynarts version? I
didn't find anything in the manua

Re: Polarization sums with dummy indices

Rolf Mertig — 2012-03-01T14:08:18+01:00

This is just how /. (ReplaceAll) works.
>From http://reference.wolfram.com/mathematica/ref/ReplaceAll.html

Re: Polarization sums with dummy indices

Ben — 2012-02-29T09:47:12+01:00

Hi Rolf,

I hope I have a minimum working example that shows that only one rule is applied.

<< HighEnergyPhysics`fc`
FI; IP = InputForm;
constraint = {
&n

Re: Polarization sums with dummy indices

Rolf Mertig — 2012-02-29T01:38:19+01:00

Hm, be careful: you cannot copy and paste FeynCalc output as input.

simple things just seem to work fine:

Mathematica 8.0 for Linux x86 (64-bit)
Copyright 1988-2011 Wolfram Re

Re: Polarization sums with dummy indices

Ben — 2012-02-28T22:32:58+01:00

I get an error if I do:

constraint =
  FeynCalcInternal[
    FV[p, muPAT] FV[p, nuPAT] ->
     PolarizationSum[mu

Re: Polarization sums with dummy indices

Rolf Mertig — 2012-02-28T17:01:50+01:00

constraint = FeynCalcInternal[
               FV[p,muPAT] FV[p,nuPAT] -> PolarizationSum[mu, nu, p1] ]/. {muPAT:

Polarization sums with dummy indices

Ben — 2012-02-28T16:07:51+01:00

Hi,

I have a pretty large matrix element with stuff like:

SP[p1, e3]*SP[p2, e4]*SP[e1, e2] *...

M^2 has polarization sums, for which I want to apply the rule. First I uncon

Re: Exact evaluation of Passarino-Veltman scalar integrals

Peter Blunden — 2012-02-25T19:42:00+01:00

A0 and B0 are easy. I believe C0 and D0 are only expressible in terms of logs and dilogs in certain limits.

Peter