MadGraph5_aMC@NLO

Inconsistent of the Cross section

Asked by teddym

Hi:
     I've calculated a process
     u u~ > w+ w- ( No further decay )
    using MG5
     And I also calculated this process using many other methods, There is a little inconsistent among these methods.
   And the results of Cross section of MG5 are always smaller than other methods in all situations. So I want to know that whether MG5 would implement any cuts at the W+ W- final states?

Thanks

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

No cut,

I would advise that you check carefully the way you check the Electroweak sector since the W mass is not a free parameter for MG but the result of the computation for the EW scheme.
So it is important that you check carefully what is the scheme use and what is the W mass used for such computations.

Cheers,

Olivier
On Jun 11, 2014, at 9:51 AM, teddym <email address hidden> wrote:

> New question #250088 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/250088
>
> Hi:
> I've calculated a process
> u u~ > w+ w- ( No further decay )
> using MG5
> And I also calculated this process using many other methods, There is a little inconsistent among these methods.
> And the results of Cross section of MG5 are always smaller than other methods in all situations. So I want to know that whether MG5 would implement any cuts at the W+ W- final states?
>
> Thanks
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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