Cross-sections provided by Madgraph+Madspin in dim-8 EFT model
Hello Madgraph Experts,
I am attempting to generate events with a dim-8 EFT (Eboli model http://
I notice a discrepancy in the resulting cross-sections recorded after running with Madspin with respect to an explicit decay chain calculation. I have used the following syntaxes and received the following values:
a) p p > j j w+ w- QCD=0 T0==1
cross-section = 0.277 pb
b) p p > j j w+ w-, (w- > l- vl), (w+ > j j) QCD=0 T0=1
cross-section = 0.0338 pb
c) p p > j j w+ w- QCD=0 T0==1 (followed by madspin in “none” mode for w- > l- vl, w+ > j j)
cross-section = 0.278 pb
d) p p > j j w+ w- QCD=0 T0==1 (followed by madspin in “madspin” mode for w- > l- vl, w+ > j j)
cross-section = 0.0618 pb
I am reading the cross-section value from the “Integrated weight (pb)” line of the produced LHE file. It might also be worth noting that for this test a quadratic EFT process was generated (applying the recommended ‘hack’ from https:/
I can see that the recorded value with spinmode=none is the same as the inclusive value so I assume the branching ratio is not applied, but I also notice that the default madspin mode does not match the full madgraph decay chain result.
Regards,
Robert Les
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