Name: Bob McElrath (email_not_shown)
Date: 05/22/04-12:54:35 AM Z


Camm Maguire [camm@enhanced.com] wrote:
> Greetings!
>
> Bob McElrath <bob+maxima@mcelrath.org> writes:
> > It also contains code for doing one-loop integrals. This same code
> > exists in several places (I know of a fortan library "ff" and a Maple
> > package "xloops" as well), and I can point to the papers if people
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> I think this would be helpful.

Let me say that this *must* be implemented by an expert. The physics
community barely trusts such codes, and the ones that are barely trusted
(such as ff) have been massively cross checked across many calculations
and papers. That said:
    http://dx.doi.org/10.1016/0550-3213(79)90605-9
Here is a more modern reference with some new ideas, and the references
will be useful:
    http://arxiv.org/abs/hep-ph/0307113
Bertfried Fauser (on CC list) works on these types of things and might
be an appropriate person to do it.

These calculations are in general plauged by singularities, and the
procedure to remove them lies in physics, not math (renormalization).
The singularities are real, but we understand that they do not affect
physical observables. If it were possible to write general algorithmic
codes, we would do it.

Cheers,
Bob McElrath [Univ. of California at Davis, Department of Physics]
    
    "A great many people think they are thinking when they are merely
    rearranging their prejudices." -- William James




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