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I found some strange behavior for DoPolarizationSums. Let

tmp = Conjugate[PolarizationVector[p, mu]] PolarizationVector[p, nu]

1) DoPolarizationSums[tmp+1,p] gives

3+e_{mu} e_{nu}

which is ok for number, but this command did nothing with polarizations.

2) DoPolarizationSums[tmp+1,p,0] gives

4-g_{mu,nu}

which is ok for tensor structure, but I expected 2 as a number.

3) DoPolarizationSums[tmp+1,p,p] gives

2 + (-g_{mu,nu} + p_{mu}p_{nu}/p^2)

which is ok for gluons, but it is not applicable for massive patricles because of 2, then 3.

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