Name: Johan (email_not_shown)
Date: 08/18/10-05:00:25 PM Z


Hi!

Could someone please help me to understand why this calculation doesn't seem to work

<<HighEnergyPhysics`FeynCalc`
Amp=FVD[q,\[Mu]] FVD[q,\[Nu]]FVD[q,\[Rho]]FVD[q,\[Sigma]]FAD[{q,m},{q+Subscript[k, 4],m},{q-Subscript[k,1]-Subscript[k, 2],m},{q-Subscript[k, 2],m}]
test=ReleaseHold[Isolate[Factor1@Collect2[TID[Amp,q],q]//FCE,q]]

when this similar amplitude is performed in a couple of seconds

<<HighEnergyPhysics`FeynCalc`
Amp=FVD[q,mu] FVD[q,nu] FVD[q,al] FVD[q,be] FAD[{q,mD},{q,Lambda},
{q,Lambda}, {p3+q,m1},{q-p4,m2}]
test=ReleaseHold[Isolate[Factor1@Collect2[TID[Amp,q],q]//FCE,q]]

Thanks a lot,
Johan



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