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Hello,

I am trying to use FeynArts -> FeynCalc -> Tarcer to compute some 2-loop self

energy integrals. However, I find that the ToTFI function won't deal with terms in

the numerator which contain an internal loop momentum. I see this when trying to

convert complicated FeynArts output, and I can reproduce the problem with a

simple example, which I copy below.

-------------------

dm[mu_] := DiracMatrix[mu, Dimension -> 4]

dm[5] := DiracMatrix[5]

ds[p_] := DiracSlash[p]

SetOptions[DiracSlash, Dimension -> 4, FeynCalcInternal -> True];

num := C dm[mu].(ds[k] - M).dm[mu].(ds[k] - ds[q] - M).

dm[nu].(ds[q] - M).dm[nu]

amp := FeynAmpDenominator[PropagatorDenominator[k - p, M],

PropagatorDenominator[k, mw], PropagatorDenominator[k - q, M],

PropagatorDenominator[q, M], PropagatorDenominator[q - p, mw]] //

Contract // FCI

tfiamp := ToTFI[DiracSimplify[num SPC[amp, k, q]], k, q, p]

tfiamp

-----------------------

The output I get is half made up of nice integrals terms like F and V and so on, but

the rest is basically just the original input, for all the terms which contain an internal

momentum (slashed) in the numerator. Is there something I am fundamentally

doing wrong with the input? I am unsure because the ToTFI instructions don't have

an example where there is a dot product of internal momentum and a gamma matrix

like this in the numerator. If I can find the problem in this example then it should

help with also converting the FeynArts output.

Thanks,

James

**Next message:**Vladyslav Shtabovenko: "Re: Tacer in FeynCalc mathematica 10.4 mac os"**Previous message:**Yan: "Re: Tacer in FeynCalc mathematica 10.4 mac os"**Next in thread:**Vladyslav Shtabovenko: "Re: ToTFI with momentum in numertor"**Reply:**Vladyslav Shtabovenko: "Re: ToTFI with momentum in numertor"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

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