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Hi,

I have a pretty large matrix element with stuff like:

SP[p1, e3]*SP[p2, e4]*SP[e1, e2] *...

M^2 has polarization sums, for which I want to apply the rule. First I uncontract my M^2:

Uncontract[Expand[M^2], e3, e1, e2, e4, p1, p2, p3, p4, Pair -> All,

Unique -> False]

Now I have a lot of dummy indices. I want to define the polarization rule, like:

constraint =

FeynCalcInternal[

FourVector[e1, mu] FourVector[e1, nu] ->

PolarizationSum[mu, nu, p1]]

But I have to specify indices (mu and nu in this case). Unfortunately, I don't know the names, because the dummy indices get automatically assigned. This auto-assigning is very useful, because I have a lot of dot products, so giving them an index manually is too much work.

Can I define a generic index, like e1(mu?)*e1(nu?), as is possible in Form?

**Next message:**Rolf Mertig: "Re: Polarization sums with dummy indices"**Previous message:**Peter Blunden: "Re: Exact evaluation of Passarino-Veltman scalar integrals"**Next in thread:**Rolf Mertig: "Re: Polarization sums with dummy indices"**Maybe reply:**Rolf Mertig: "Re: Polarization sums with dummy indices"**Maybe reply:**Ben: "Re: Polarization sums with dummy indices"**Maybe reply:**Rolf Mertig: "Re: Polarization sums with dummy indices"**Maybe reply:**Ben: "Re: Polarization sums with dummy indices"**Maybe reply:**Rolf Mertig: "Re: Polarization sums with dummy indices"**Maybe reply:**Vladyslav Shtabovenko: "Re: Polarization sums with dummy indices"**Maybe reply:**Kyrylo Bondarenko: "Re: Polarization sums with dummy indices"**Maybe reply:**Kyrylo Bondarenko: "Re: Polarization sums with dummy indices"**Maybe reply:**Vladyslav Shtabovenko: "Re: Polarization sums with dummy indices"**Maybe reply:**Vladyslav Shtabovenko: "Re: Polarization sums with dummy indices"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

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