Thank you for help but i am getting the following output :
for h :-
Contract(Subscript[\[CurlyEpsilon], \[Mu]](q) Overscript[u, _](p2,m2).\[Gamma]^0.u(p1,m1))
for h2 :-
4 Contract(\!\(
\*SubsuperscriptBox[\(\[CurlyEpsilon]\), \(TraditionalForm\`\(TraditionalForm\`\[Mu]\)\), \(*\)](q)\) HighEnergyPhysics`fctools`DiracTrace`Private`spursav(\[CurlyPhi](p1,m1),\[Gamma]^0,\[CurlyPhi](p2,m2))) Contract(Subscript[\[CurlyEpsilon], \[Mu]](q) HighEnergyPhysics`fctools`DiracTrace`Private`spursav(\[CurlyPhi](p2,m2),\[Gamma]^0,\[CurlyPhi](p1,m1)))
I don't know about this error message .
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