MadGraph reweight technique
Hello,
I generated the events with an external model which contains a heavy higgs ( hh ), and the process is:
p p > z hh, z > l- l+, hh > j j j j
There are two parameters we can change. They are fw and fww that influence the coupling between heavy higgs and vector boson and the decay width of heavy higgs.
I would like to use MadGraph to reweight the generated events with a different setting of fw and fww.
For example, I generated events with fw=600 and fw=3600 (case A). Then, I want to reweight these events with fw=800 and fww=4800 (case B). The jet pt distribution of case A is similar with the jet pt distribution of case B. The cross-section of case B is larger than the cross-section of case A in theory.
I reweight the events by command:
The setting of reweight_card.dat is ( the decay width of heavy higgs is always set to auto):
launch --rwgt_
set DIM6COEFF 3 8.0000e+02
set DIM6COEFF 4 4.8000e+03
set DECAY 254 auto
Then, I got the following output information:
INFO: central : 7.741888-112e-05
INFO: fw800fww4800 : 7.0747137441e-05
It seems the reweighted cross-section isn't correct and not corresponding with the MG5 cross-section.
I also tried with different settings of fw and fww. I found that the reweighted cross-section is corresponding with the MG5 cross-section sometimes, but sometimes isn't.
How do these happen? How can I get a correct reweighted cross-section?
Thanks.
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