Total cross section is not matching

Asked by Sarif Khan on 2018-01-14

I am generating a process: e+ e- > h+ h- and it is giving me a cross section, say "x".
>generate e+ e- > h+ h- (giving me cross section, say "x")
 Now if I consider all
the decay modes of "h" then it is giving me cross section, say "y".
>generate e+ e- > h+ h-,(h+ > N l+ ),(h- > N l-) (giving me cross section, say "y")
where l = e, mu, tau
My concern is "x" and "y" should match
but it is not happening in my case (there is a gap between the two around 100 fb). I am unable to figure out
my mistakes. Can you please help me in this regard?
I am also making the cut decays to false.
Thank you.

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Olivier Mattelaer suggests this article as an answer to your question:
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FAQ #2442: “why production and decay cross-section didn't agree.”.

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