Name: Maksym Ovchynnikov (email_not_shown)
Date: 05/30/19-04:16:47 PM Z

Hi!

I tried to simplify the following expression:

Amplitude1 =
 DiracSimplify[
  I*(e*g^2)/
   8 (MetricTensor[\[Kappa], \[Lambda]] (ScalarProduct[k,
         k] - \[Alpha] mW^2) -
     FV[k, \[Kappa]] FV[k, \[Lambda]]) DiracMatrix[\[Kappa]].(1 -
      DiracMatrix[5]).(GSD[pprime] - GSD[k] +
      ml).DiracMatrix[\[Mu]].(GSD[pprime] - GSD[k] +
      ml) DiracMatrix[\[Lambda]].(1 - DiracMatrix[5]) FAD[{k,
     Sqrt[\[Alpha]] mW}, {pprime - k, ml}, {p - k, ml}, {k, mW}]]

However, there is an error:

"DiracTrick::failmsg: Error! DiracTrick has encountered a fatal problem and must abort the computation. The problem reads: Incorrect combination of dimensions and g^5 scheme!"

What is a reason for this?

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