maxjetflavor giving unexpected results
Dear Madgraph Experts,
I've become a bit confused about the functionality of the tag "maxjetflavor" in the run card for MG5. My understanding was that this simply determined whether or not the jet cuts (ptj, etc.) applied to b-jets or not. However, when I run a process with the same cuts applied to the jets and the b-jets, and change maxjetflavor from 4 to 5, I get a different result for the cross section.
As an example, I've tried:
import model heft
generate p p > h b b~
set ebeam1 13500.0
set ebeam2 13500.0
ptj 20.0
ptb 20.0
etaj 2.5
etab 2.5
drjj 0.4
drbb 0.4
drbj 0.4
with all other jet and b-jet cuts turned off. Instead of getting the same result, however, I find:
0.246 pb for maxjetflavor = 4
0.2054 pb for maxjetflavor = 5
which is quite a substantial difference. I've tried editing the parameters in the model file (to set the bottom quark to be massless, for instance), but this doesn't seem to have much affect. Is there something that maxjetflavor is doing that I'm not understanding?
Thanks very much,
Sam
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