Name: Xing-Bo Yuan Date: 04/12/16-02:43:47 PM Z


Hi Vladyslav,

Thank you for the detailed explanation.

For question.2 After running your code, I still get a strange result

(Spinor[Momentum[k], 0, 1] . DiracGamma[LorentzIndex[\[Mu]]] .
   DiracGamma[7] . Spinor[Momentum[p1], FCGV[”]”*“FCGV[”*ML], 1]*
  Spinor[Momentum[k2], FCGV[”]”*“FCGV[”*MD], 1] .
   DiracGamma[LorentzIndex[\[Mu]]] . DiracGamma[7] .
   Spinor[-Momentum[k1], FCGV[”]”*“FCGV[”*MU], 1]*
  FCGV[”]”*“FCGV[”*EL]^2*FeynAmpDenominator[
   PropagatorDenominator[Momentum[k1 + k2],
    FCGV[”]”*“FCGV[”*MW]]])/(2*FCGV[”]”*“FCGV[”*SW]^2)

Best
Xing-Bo Yuan