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Hi Rolf,

Related to my previous email, I did everything with FeynCalc 4.1.1 just to

be sure that it is not an version issue but almost nothing changed. That's

why, I want to attach a sample calculation that I am trying to do with

FeynCalc(it seems I am not allowed to ettach a file so I should find a way to send the file separately). It is very short and simple calculation. There are three one

loop matrix elements that I included. They are called WSelfoffglnA,

WSelfoffglnA, and WSelfonglnC1. It is a small part of top-c-gluon-gluon

calculation.

Interestingly, the first one is being computed within 20 seconds but the

second one took around 68 minutes. So far I haven't gotten any answer from

the third one. But they are self energy diagrams and very similar to each

other. I have no idea why the second and the third diagram take such a

long time but not the first. Is really the program that slow? If so, I

guess I wouldn't finish my calculation at all. I have around 20 one-loop

diagrams.

Another but minor thing is that even though I defined at the beginning of

the notebook some on shell conditions but the program never takes into

account them. Whenever I get the answer from OneLoop[] and if I use FCE,

then they are implemented. Obviously keeping such terms to the end costs

time.

What should I do to make the calculation effective? Obviously I must be

missing things. This can't be the picture.

If you can take a look to my notebook, I would really appreciate it.

I am using AMD Athlon(comparable with Pentium III), 512RAM.

Thanks a lot in advance,

Ismail

PS: BTW, Is there a way to calculate cross section or decay width or

numeric calculation of PaVe functions A0,B0,C0,D0 with FeynCalc? or is it

only good for calculation the matrix element squared M2(I haven't seen any

documentation beyond M2 calculation).

**Next message:**rolf mertig: "Re: OneLoop with complicated denominator"**Previous message:**Ismail Turan: "OneLoop with complicated denominator"**In reply to:**Ismail Turan: "OneLoop with complicated denominator"**Next in thread:**rolf mertig: "Re: OneLoop with complicated denominator"**Reply:**rolf mertig: "Re: OneLoop with complicated denominator"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

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