MadGraph5_aMC@NLO

using two body decays only

Asked by Anthony DiFranzo

Hello!

I was curious if there is a way to calculate two-body decays widths without also calculating the three-body contribution as well. I noticed that in Madevent, the function 'compute_widths' takes '--precision=' as an argument, which seems that it may be used to specify the number of final state particles. However, I get errors whenever I set this to anything but 0. For example, I get this error:

Command "compute_widths h --precision=2" interrupted in sub-command:
"set complex_mass_scheme False" with error:
InvalidCmd : --precision not valid options

I'm most likely using this incorrectly, but any input would be greatly appreciated!

Anthony

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Solved by:
Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Anthony,

You have to use the option
—body_decay=2

Cheers,

Olivier
On Jun 19, 2014, at 3:11 PM, Anthony DiFranzo <email address hidden> wrote:

> New question #250451 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/250451
>
> Hello!
>
> I was curious if there is a way to calculate two-body decays widths without also calculating the three-body contribution as well. I noticed that in Madevent, the function 'compute_widths' takes '--precision=' as an argument, which seems that it may be used to specify the number of final state particles. However, I get errors whenever I set this to anything but 0. For example, I get this error:
>
> Command "compute_widths h --precision=2" interrupted in sub-command:
> "set complex_mass_scheme False" with error:
> InvalidCmd : --precision not valid options
>
> I'm most likely using this incorrectly, but any input would be greatly appreciated!
>
> Anthony
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Anthony DiFranzo (adifranz) said : 		#2

That's fantastic, Olivier! It's weet and simple, thanks for the response.
Anthony

Revision history for this message
Anthony DiFranzo (adifranz) said : 		#3

Thanks Olivier Mattelaer, that solved my question.