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•Preliminaries

$manrules = {MandelstamS + MandelstamT + MandelstamU -> 4 ParticleMass[Pion, RenormalizationState[1]]^2, MandelstamS + MandelstamT -> 4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamU, MandelstamS + MandelstamU -> 4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamT, MandelstamU + MandelstamT -> 4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamS, a_ * MandelstamS + a_ * MandelstamT -> a (4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamU), a_ * MandelstamS + a_ * MandelstamU -> a (4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamT), a_ * MandelstamU + a_ * MandelstamT -> a (4 ParticleMass[Pion, RenormalizationState[1]]^2 - MandelstamS)} ;$

${MomentaSumLeft -> All, OnMassShell -> True, Cancel -> u, MomentumVariablesString -> p, MomentaSumRule -> True, Masses -> {m _ π^(ó r ), m _ π^(ó r ), m _ π^(ó r ), m _ π^(ó r )}}$

NOTICE: The default convention of Phi is at variance with the default convention of FeynCalc w.r.t. Mandelstam variables (t<->u). Below u is correspondingly written before t, setting the FeynCalc Mandelstam variables in agreement with the Phi default convention. Uncommenting should speed things up.

Converted by Mathematica (July 10, 2003)