madspin decay (syntax)
Hi Olivier,
I am trying to generate events for process gg > h2 > h3 z* > h1 z* z* > bb jj mu+mu-, with h1 > b b~, h2 is. SM-like and mh1, mh3 < mh2 (2hdm type-1). I am using madgraph to compute the cross-section of this process.
PS: z's are off-shell.
I am confused because of the difference in the cross section due to the syntax:
part 1:
gg> h2 z > h3 mu+ mu-, ( h3 > z > h1 j j)
cross section = 3.57x10^-4 pb
part 2 :
gg> h2 z > h3 mu+ mu-, ( h3 > z > h1 j j, h1 > b b~)
cross section = 0.48pb
The first value seems more reasonable since h2 is SM-like. What do you think is the reason behind the huge difference?
I tried to compute the cross-section using madgraph (gg > h2) and madspin (for the rest of the process), but then I am getting different values for different syntax (FAQ):
#=============
Madspin
#============
case1:
# specify the decay for the final state particles
decay h2 > z > h3 mu+ mu-, h3 > z > h1 j j, h1 > b b~
sigma = 6.7x10^-4pb
case 2
# specify the decay for the final state particles
decay h2 > z > h3 mu+ mu-, (h3 > z > h1 j j, h1 > b b~)
sigama = 0.54pb
Many thanks for any suggestion or explanation to alleviate the confusion.
Best regards
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