Mismatch of CS

Asked by teddym on 2015-08-13

Hi:
    If I first generate process: p p > zprime w, MG5 will give the cross section, say, cs1.
   Further if I decay the particle zprime, like p p > zprime w, zprime > ~chi1 ~chi2 , and I have replace the decay width of zprime with "auto", then MG5 will also give the cross section, say, cs2.
  Generally, cs2 should not be larger than cs1 (since cs2=cs1*Br). But I get larger value from MG5. What happened? How should treat the results of cs1 and cs2?

Best!

Ted

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Last query:
2015-08-13
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2015-08-13
shibasipu (shibasipu) said : #1

Hello Ted,

       Please have a look to the link given below. May be helpful !!!!!!!!!

https://answers.launchpad.net/mg5amcnlo/+faq/2442

Regards,
Shiba

I think that point 3 of the following FAQ might explains your point (depend also on how much larger cs2 is)

Cheers,

Olivier
FAQ #2442: “why production and decay cross-section didn't agree.”.

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