generating u b > d t process

Asked by Steven Jeremies on 2021-05-23

Hi everyone,

I am just getting started with madgraph and initially wanted to compare my calculated matrix element of the W exchange process
u b > d t .
I tried to generate it as follows:

>> generate u b~ > d t~ QED=2

and received the error "No amplitudes generated from process Process: u b~ > d t~ QED=2 @1. Please enter a valid process."

Can anyone please help me correcting my input?

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Solved by:
Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said :

If you want u b > d t, why do you ask u b~ > d t~?

> MG5_aMC> generate u b > d t
> INFO: Checking for minimal orders which gives processes.
> INFO: Please specify coupling orders to bypass this step.
> INFO: Trying coupling order WEIGHTED<=2: WEIGTHED IS QCD+2*QED
> INFO: Trying coupling order WEIGHTED<=3: WEIGTHED IS QCD+2*QED
> INFO: Trying process: u b > d t WEIGHTED<=4 @1
> INFO: Process has 1 diagrams
> 1 processes with 1 diagrams generated in 0.009 s

> On 23 May 2021, at 15:55, Steven Jeremies <email address hidden> wrote:
>>> generate u b~ > d t~

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Steven Jeremies (minits) said :

Thanks Olivier Mattelaer, that solved my question.