Name: V. Shtabovenko (email_not_shown)
Date: 06/03/18-03:44:00 PM Z


It has been a long time since this question was asked, but I just would
like to point out that this is issue is being worked on.

Since today the development version finally offers a possibility to
enter propagators different from 1/(k^2-m^2).

The residual mass HQET propagator can be written using the new SFAD
representation:

SFAD[{{0, q.p}, m^2}]

while

SFAD[{{0, q.p}}]

is the familiar SCET propagator 1/p.q

At the moment one cannot really do much with it, i.e. the standard
functions like TID, FDS, ApartFF etc. will not process such integrals,
but this is just the first step.

It will of course take time to properly integrate SFAD (and its
Cartesian version CFAD) into FeynCalc, but this is something I'm really
working on.

Cheers,
Vladyslav

> In HQET(Heavy Quark Effective Theory) we come across may loop integrals where one of the propagators is v.k rather than k.k-m^2. I was wondering if there is a way for OneLoop to handle these integrals? An example would be:
>
> AMP = FAD[{q,m}] 1/(ScalarProduct[q,v]-X);
> OneLoop[q,AMP]
>
> Gives 0, but the answer by hand is not zero. (X here is just some constant to displace the propagator.)
>
> The actual result can be found a number of places:
> (http://arxiv.org/abs/hep-ph/9605342 Equation # 407)
>
> Is there a way to input that second part so OneLoop can calculate it?



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