Name: Mario Schenberg Date: 11/12/14-02:47:03 AM Z
Hi,
I’m doing a 1-loop computation in the Standard Model and I find different results depending on the order in which I use the functions DiracSimplify and OneLoop. Is it normal? I only get the correct result if I apply DiracSimplify before OneLoop.
Thanks in advance.
MS.
*Method 1 (gives the correct):
num3 = Spinor[q - p, mb . dm[a] . PL . (ds[k] + mi)
. dm[a] . PL . (ds[q] - ds[p] + 0) .
dm[f] . (2 sw^2 - PL) . Spinor[-p, 0] ;
Simplify[DiracSimplify[num3]] ;
amp3 = %*FeynAmpDenominator[PropagatorDenominator[k, mi],
PropagatorDenominator[q - p - k, mW]];
I3 = Simplify[OneLoop[k, amp3]];
*Method 2 (gives the wrong result):
amp3w = num3*
FeynAmpDenominator[PropagatorDenominator[k, mi],
PropagatorDenominator[q - p - k, mW]];
I3w = Simplify[OneLoop[k, amp3w]];