Name: FengF Date: 04/07/06-06:48:20 AM Z
Hi , Sir
I have a problem with the Tr and Calc Command
The example is :
Lepton=FV[k1,mu]FV[k2,nu]+FV[k2,mu]VF[k1,nu]-SP[k1,k2]MT[mu,nu]
Quark=FV[p3,alhpa]FV[k,beta]+FV[k,alpha]VF[p3,beta]-SP[k,p3]MT[alpha,beta]
AA=GA[mu].(GS[p1+p3-k]+m).GS[alpha].(GS[p1]+m).GS[5].GS[S].GA[nu].(GS[k+p2-p3]+m).GA[beta].(GS[p2]-m)
Calc[Quark Lepton Tr[AA]]
and
Calc[Tr[Quark Lepton Calc[AA]]]
give different results
tr=TR[Calc[#]]&;
Calc[Quark Lepton Tr[AA]]
give the same result as
Calc[Tr[Quark Lepton Calc[AA]]]
and
Calc[Quark Lepton Tr[Calc[AA]]]
So is it nessissery to use the Calc before Tr ?
Thanks