Cross section bb+Phi(chichi) larger than bb+Phi
Dear MadGraph experts
Using a private model of SM with an extra (pseudo) scalar mediator ('phi') that couples to dark matter ('chi'), I observe unexpected features when going to large mediator masses, comparing the following processes:
1) 'p p > b b~ phi'
2) 'p p > b b~ phi, phi > chi chi~'
- Around Mphi~2TeV, the production cross section of bb+phi(chichi), i.e. with the mediator decaying to DM particles, becomes larger than the production of bb+phi, i.e. without decaying the mediator.
- For larger mass, around Mphi~5TeV, the same effect is observed for tt+phi production compared to tt+phi(chichi).
Naively, I would conclude that the BR(phi-
So maybe the production process with the mediator in the final state (1) is not expected to give physical results due to the width?
Then, still, I am surprised that the effect seems to be more present when producing the mediator in association with b's than with t's.
Would you have an idea what could be going on?
Thanks
Tristan
PS: Results for 'p p > b b~ phi, phi > chi chi~' are the same as for 'p p > b b~ chi chi~', so this is not the reason. Just saying to avoid confusion.
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