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chen <chendy@ihep.ac.cn> wrote:

*> Hi,
*

*>
*

*> I have a puzzle in my calculations.
*

This is a brute force approach, but it works. Otherwise, you might try playing with ComplexIndex.

<<HighEnergyPhysics`FeynCalc`

ScalarProduct[p0,p0]=m02;

ScalarProduct[p3,p3]=m32;

ScalarProduct[p4,p4]=0;

ScalarProduct[p0,p3]=m0*E3;

ScalarProduct[p0,p4]=m0*pf;

ScalarProduct[p3,p4]=E3*pf+pf2;

pf=(m02-m32)/2/m0;

E3=(m02 + m32)/(2*m0);

repV={epsC2->PolarizationSum[mu,muc,p0],

epsV2->PolarizationSum[nu,nuc,p3],

epsG2->PolarizationSum[rho,rhoc]};

amp=epsC*epsV*epsG*LC[mu,nu,lambda,tau]*FV[p3,rho]*

FV[p3,lambda]*FV[p4,tau]//Contract;

ampstar=amp/.mu->muc/.nu->nuc/.rho->rhoc;

CS=amp*ampstar/.repV//Expand//Contract//Simplify;

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