The difference between decay in MadGraph and decay in MadSpin
Dear MG5 experts,
I'm generating process p p > z a j j QCD=0 QED=5, z > vl vl~ and get the following cross sections:
0.00714+-0.00002 pb (1) - with default sm model ;
0.0867+-0.0002 pb (2) - with 8-dim EFT model SM_LT012_UFO using f_{T0}=2.9*10^{-12} GeV^{-4} (http://
Also I can generate this process in an alternative way:
1. Firstly by generating p p > z a j j QCD=0 QED=5, which gives the following results:
0.03555+-0.00008 pb - in sm;
0.4449+-0.0007 pb - in SM_LT012_UFO.
2. Secondly by using MadSpin (./Madspin/madspin) to decay z > vl vl~. After MadSpin I have the following results:
0.00724+-0.00002 pb (3) - in sm;
0.0918+-0.0002 pb (4) - in SM_LT012_UFO.
How can be explained differences in cross sections (1) and (3), (2) and (4)? These differences can not by covered by statistical
uncertainty.
With best regards,
Artur
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