**Next message:**Peter Blunden: "Bizarre bug"**Previous message:**Francesco Tramontano: "Problems using Tr[] and DiracSimplify[] with GA[5]"**Next in thread:**Frederik Orellana: "Re: Problem using OneLoop"**Reply:**Frederik Orellana: "Re: Problem using OneLoop"**Maybe reply:**V. Shtabovenko: "Problem using OneLoop"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

I'm trying to do an integral that FeynCalc chokes on. The message returned

is the usual

FYI: Tensor integrals of rank higher than 3 encountered; Please use the

option CancelQP -> True or OneLoopSimplify->True or use another program.

However, it appears that CancelQP->True is the default, and OneLoopSimplify

expresses the results in terms of Contract3, which doesn't seem to exist.

The integrals are box diagrams, and a typical term would look something like

(k.p1)^3 / [k^2-lam^2][(k-q)^2-lam^2][(k-p1)^2-m^2][(k+p2)^2-M^2]

where p1^2=m^2 and p2^2=M^2. This term looks innocent enough, and in fact

looks to me like it IS of rank 3. By a lot of fudging and manipulating I

managed to get a result using ScalarProductCancel, but it is hit and miss

for various terms in the amplitude.

Is there a fix in FeynCalc, or do I have to use another program (and if so,

which one)?

**Next message:**Peter Blunden: "Bizarre bug"**Previous message:**Francesco Tramontano: "Problems using Tr[] and DiracSimplify[] with GA[5]"**Next in thread:**Frederik Orellana: "Re: Problem using OneLoop"**Reply:**Frederik Orellana: "Re: Problem using OneLoop"**Maybe reply:**V. Shtabovenko: "Problem using OneLoop"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

*
This archive was generated by hypermail 2b29
: 02/21/18-06:00:07 AM Z CET
*