Name: Fabrizio Nesti Date: 06/21/11-05:51:36 PM Z
Dear Rolf,
I seem to find a weird behavior of FeynCalc when calculating a sim[ple self-energy, due to a W loop: changing Dimension->4 to Dimenson->D the loop variable results in the output (and it should not!).
INT[X_] := OneLoop[k, X, Dimension -> D, OneLoopSimplify
-> False,
ReduceGamma -> True];
AMPLITUDE =
Contract[GAD[\[Alpha]].PL.(GSD[k] +
GSD[p] +
mi).GAD[\[Beta]].PL.FAD[{k + p,
mi}].\[CapitalDelta]g[k,
0, \[Alpha], \[Beta], M, 1]]
INT[AMPLITUDE] // PaVeReduce // Simplify
Gives (notice the kslash!)
(I \[Pi] (-(M^2-mi^2+p^2) SubscriptB, 0+(M^2-mi^2) SubscriptB, 0+p^2) (-(\[Gamma]\[CenterDot]k).\[Gamma]^5+\[Gamma]\[CenterDot]k-(\[Gamma]\[CenterDot]p).\[Gamma]^5+\[Gamma]\[CenterDot]p))/(2 p^2)
Any hint? Thanks a lot!
Fabrizio
PS: Putting Dimension->4 the result has no kslash (but the finite part seems not to agree with the textbook result….
PPS: running FeynCalc 8b2 on Mathematica8