error about the decay channel interrepted error

Asked by Muhammad Farooq on 2020-02-13

Here, When I am going to pass a decay channel i have to face the error about this. My channel is this:
g g→ H^0→ W^∓ H^±→W^∓ W^± h^0→W^∓ W^± bb ̅
 The error about this channel on MG%-aMC terminal is given below:

MG5_aMC>generate g g > h2 , h2 > w- w+ h+ h- , (h+ h- > w+ w- h01 , h01 > b b~)
INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
INFO: Trying process: g g > h2 WEIGHTED<=2 @1
Command "generate g g > h2 , h2 > w- w+ h+ h- , (h+ h- > w+ w- h01 , h01 > b b~)" interrupted with error:
NoDiagramException : No amplitudes generated from process Process: g g > h2 WEIGHTED=2 @1
   Decay: h2 > w- w+ h+ h-
   Decay: h+ h- > w+ w- h01
     Decay: h01 > b b~. Please enter a valid process

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
2020-02-13
Last reply:
2020-02-13

Hi,

1) Looks like your model does not define a tree-level interaction for
g g > h2
So you need to use another model (or use loop induced mode)

2) your syntax:
, (h+ h- > w+ w- h01)
is not allowed, this is not a decay chain (you can not try to compute one loop diagram like that.
If this is a second loop that you want to achieve, I'm not sure how to achieve this.

Cheers,

Olivier

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