cross-sections differ a lot between different input random numbers
Hi Madgraph experts:
These days, I'd like to generate some EFT samples for Offshell HZZ->4l, especially on the operator: cpG. (SM*cpG). This SM*cpG is calculated by reweighting SM*ctp.
But I met a problem with the cross-section. (or integrated cross-section)
I generate using two different input random numbers, like 123456 and 54321. Except for the input random numbers, all the settings are the same.
But I got two different cross-sections:
(1) 0.000135413 pb
(2) -9.75099e-05 pb
which are different quite a lot!!
Do you think this is reasonable? (while I thought the cross-section of a process is fixed, or well-determined)
Another question I'd like to ask is: what's the relationship between the "integrated cross-section" of all events and the "weight" of each event? How to calculate them? Do you have a document or paper that I can have a look at on the details?
Thanks so much in advance!!!
Please let me know if you need further information.
Yingjie
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