Decaying using MadSpin gives incorrect xsec or max weight
Hello,
I am trying to generate g g > z z g g [noborn=QCD] with z > l+ l- in MadSpin. I was successful in generating the process with z resonances. In an earlier answer, you mentioned how Loop Induced processes can only be decayed upon setting spin mode none in the MadSpin card. Since the two jet contribution ought to be a small correction to the ggF 0+1 jet processes, I decided to go forward with this reduced accuracy. However the total weight I get after decaying the z resonances is almost similar to the xsec of g g > z z g g process. It is even greater than 1 jet process.
For further checks, I ran g g > z z first and then decayed the z resonance to two leptons and compared the results with g g > l+ l- l+ l- xsec. Again the results are widely different between the two. Doing MadSpin way gives me the max weight of about 5.4102e-03 while g g > l+ l- l+ l- gives 2.861e-03.
Can setting spin mode to none cause such a large discrepancy? Or am I doing something wrong? Heres how the spin card looks like:
set Nevents_
set spinmode none
set max_weight_ps_point 400
decay z > l+ l-; z > l+ l-
launch
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